Offer different pylance modes to enable light vs full IntelliSense experience

[luabud]

Right now we can tweak settings such as enabling/disabling indexing, changing indexing limit, packageIndexDepths etc to decrease/increase the amount of resources that are used, which also impacts the type of information we are able to offer as part of our IntelliSense features. It'd be nice if we had different indexing "modes" (e.g. lightweight for stdlib and open files only, default for what we do now, and full which indexes as much as we can) that users can change depending on what they want and need.

[heejaechang]

this will require some groundwork before doing this work.

1. resolve indexing perf regression we are having (or improve it better than before)
2. support requirements.txt and pyproject.toml to limit how much we index, show in completion and etc in full mode (otherwise, it will be too much)
3. support alias in user files's indexing (we have cut it due to perf issue)

[heejaechang]

1. resolve indexing perf regression we are having (or improve it better than before)

this has been handled by https://github.com/microsoft/pyrx/pull/5007 and microsoft/pyright#7652

[luabud]

One idea inspired by cases like #6055 is to have lightweight mode disable workspace wide features, and offer open file support only

[heejaechang]

there is another issue that UX could be improved by light mode - #5881

[heejaechang]

another PR related to this issue - https://github.com/microsoft/pyrx/pull/5437

[nineteendo]

Did you mean: microsoft/pyright#5437?

[heejaechang]

@nineteendo no, that's not related to this work. might be related to something @debonte working on that's about doc annotation?

[nineteendo]

Is microsoft/pyrx just a private repo?

[rchiodo]

Is microsoft/pyrx just a private repo?

Yes it's the source location for Pylance. Which is based on Pyright.