[Build] Support module resolution node16 and nodeNext #13797
Description
To support the new module resolutions (introduced in ts 4.7) we will need to add extensions to the declaration files (just like we are adding to the generated .js files).
This might require us to change the repository structure (adding .js to the imports in our libraries), or we will need to parse all generated files and add .js manually.
From initial tests - doing that will not break the current moduleResolution used (i.e. node), so there is no back-compat issue here. This, however, needs to be tested as part of the implementation of this issue.