[BR-2340]: fix/add url encoding to the getFolder/FileByPath functions

[jzunigax2]

getFolderByPath and getFileByPath interpolated their argument straight into the query string:

this.client.get(folders/meta?path=${folderPath}, this.headers());

Any reserved character in an item name therefore changed the request rather than the value. & starts a new query param and # is dropped as a fragment before the request is even sent, so both truncate the path — /a&b.txt reaches the API as /a. A literal %2F in a name is decoded server-side into a path separator, and + into a space. In every case the API gets a syntactically valid but different path, so the lookup 404s on an item that exists, or resolves to the wrong one.

Both methods now build the query with URLSearchParams, matching getFolderContentByUuid and getFavorites

No client aside from cli calls these methods