new terminal options for debugging.

[byehack]

From microsoft/vscode#130518

there is internalConsoleOptions in launch configurations options. via set it to "neverOpen" we can prevent from opening debug console.

but some projects doesn't need open terminal on debug starts. there should be internalTerminalOptions. here is the options:
"neverOpen"
"openUnfocused"
"alwaysOpen"(Default)

[brettcannon]

Moved to #16996