stream: cut per-chunk overhead in WHATWG streams

[mcollina]

Consolidates the spec's per-chunk predicate chains into single passes over the controller/stream state, mirrors "close queued or in flight" as a boolean flag, and materializes the TransformStream [[backpressureChangePromise]] record lazily on first observation.

Benchmark results (benchmark/compare.js --runs 10 vs main, same-day build):

webstreams/pipe-to.js (all 16 hwm configs)                 ***  +16.6% .. +23.1%
webstreams/readable-read-buffered.js (all 4 sizes)         ***  +17.7% .. +23.5%
webstreams/readable-async-iterator.js n=100000             ***  +18.4%
webstreams/readable-read.js type='byob' n=100000           ***   +3.6%
webstreams/creation.js kind='TransformStream' n=50000      ***   +6.7%

No regressions on the remaining rows (n.s.). WPT streams/compression/encoding and all parallel whatwg/webstream tests pass unchanged.

[aduh95]

Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1879/
Benchmark GHA: https://github.com/nodejs/node/actions/runs/28576859103

Results

                                                                       confidence improvement accuracy (*)   (**)  (***)
webstreams/creation.js kind='ReadableStream.tee' n=50000                              -0.07 %       ±0.51% ±0.68% ±0.89%
webstreams/creation.js kind='ReadableStream' n=50000                            *      5.00 %       ±4.75% ±6.33% ±8.23%
webstreams/creation.js kind='ReadableStreamBYOBReader' n=50000                         0.10 %       ±1.39% ±1.85% ±2.40%
webstreams/creation.js kind='ReadableStreamDefaultReader' n=50000                     -0.24 %       ±1.53% ±2.05% ±2.68%
webstreams/creation.js kind='TransformStream' n=50000                         ***     10.64 %       ±1.32% ±1.77% ±2.32%
webstreams/creation.js kind='WritableStream' n=50000                                   1.10 %       ±1.66% ±2.21% ±2.88%
webstreams/js_transfer.js n=10000 payload='ReadableStream'                             0.61 %       ±0.68% ±0.91% ±1.19%
webstreams/js_transfer.js n=10000 payload='TransformStream'                            0.28 %       ±0.42% ±0.56% ±0.74%
webstreams/js_transfer.js n=10000 payload='WritableStream'                             0.36 %       ±0.46% ±0.61% ±0.79%
webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=1024 n=500000        ***     22.40 %       ±1.26% ±1.69% ±2.20%
webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=2048 n=500000        ***     21.74 %       ±1.26% ±1.68% ±2.20%
webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=4096 n=500000        ***     21.97 %       ±1.41% ±1.88% ±2.45%
webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=512 n=500000         ***     21.75 %       ±1.45% ±1.93% ±2.52%
webstreams/pipe-to.js highWaterMarkW=2048 highWaterMarkR=1024 n=500000        ***     20.77 %       ±0.96% ±1.28% ±1.67%
webstreams/pipe-to.js highWaterMarkW=2048 highWaterMarkR=2048 n=500000        ***     21.73 %       ±1.19% ±1.58% ±2.05%
webstreams/pipe-to.js highWaterMarkW=2048 highWaterMarkR=4096 n=500000        ***     20.86 %       ±1.14% ±1.52% ±1.99%
webstreams/pipe-to.js highWaterMarkW=2048 highWaterMarkR=512 n=500000         ***     22.52 %       ±1.47% ±1.95% ±2.55%
webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=1024 n=500000        ***     21.78 %       ±1.48% ±1.96% ±2.56%
webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=2048 n=500000        ***     21.54 %       ±1.50% ±2.00% ±2.60%
webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=4096 n=500000        ***     21.30 %       ±1.42% ±1.89% ±2.47%
webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=512 n=500000         ***     22.06 %       ±1.34% ±1.79% ±2.33%
webstreams/pipe-to.js highWaterMarkW=512 highWaterMarkR=1024 n=500000         ***     20.39 %       ±1.03% ±1.37% ±1.78%
webstreams/pipe-to.js highWaterMarkW=512 highWaterMarkR=2048 n=500000         ***     22.06 %       ±1.46% ±1.95% ±2.54%
webstreams/pipe-to.js highWaterMarkW=512 highWaterMarkR=4096 n=500000         ***     21.28 %       ±1.56% ±2.07% ±2.70%
webstreams/pipe-to.js highWaterMarkW=512 highWaterMarkR=512 n=500000          ***     23.02 %       ±1.38% ±1.84% ±2.40%
webstreams/readable-async-iterator.js n=100000                                ***     20.85 %       ±3.71% ±4.99% ±6.58%
webstreams/readable-read-buffered.js bufferSize=1 n=100000                    ***     19.68 %       ±2.72% ±3.62% ±4.71%
webstreams/readable-read-buffered.js bufferSize=10 n=100000                   ***     21.95 %       ±4.79% ±6.39% ±8.35%
webstreams/readable-read-buffered.js bufferSize=100 n=100000                  ***     15.02 %       ±4.16% ±5.56% ±7.27%
webstreams/readable-read-buffered.js bufferSize=1000 n=100000                 ***     20.77 %       ±3.95% ±5.29% ±6.94%
webstreams/readable-read.js type='byob' n=100000                              ***      2.41 %       ±1.17% ±1.56% ±2.03%
webstreams/readable-read.js type='normal' n=100000                            ***     16.87 %       ±2.32% ±3.09% ±4.02%

Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case, there are 32 comparisons, you can thus
expect the following amount of false-positive results:
  1.60 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.32 false positives, when considering a   1% risk acceptance (**, ***),
  0.03 false positives, when considering a 0.1% risk acceptance (***)

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/74504/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/74515/