wip towards PY-10591 Add SCons support (completion, resolve)

[van800]

Currently too many manual steps to consider it a recommended approach.

Given that godot.sln is opened in Rider.

1. Include your SConstuct files in the project

    <ItemGroup>
        <None Include="**/SConstruct"/>
    </ItemGroup>

2. Install Python Community plugin in Rider
3. Point Python File Type to Sconstruct

4. Generate _scons_stubs or coping from this PR
5. In the context menu of the solution call "Attach existing folder", point it to _scons_stubs folder.
6. Add

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from _scons_stubs.SCons.Stubs import *  # noqa: F401,F403 — used only for IDE/type checking

on top of your SConstruct file. Check example in the PR.

I think I know how to automate steps 3 and 4, 5, but not 6.

The main SConstruct is almost green except 4 unresolved place, which static analysers would never handle.

[van800]

It looks a bit sad on the scons side though
SCons/scons#4661
SCons/scons#4662 (comment)

[van800]

Heh, today I found that actually stubs were already done in
https://github.com/godotengine/godot/blob/9f9ee0c813443333a49c797083ff456629c009fb/misc/utility/scons_hints.py

Only requires just copy-paste scons_hints.py to https://github.com/godotengine/godot-cpp and import in every SConstruct with a line similar to https://github.com/godotengine/godot/blob/bc85da65a54cc29a9a18311c5980c25f7f492b2c/SConstruct#L2

[van800]

If you see trouble with setting Python Interpreter https://youtrack.jetbrains.com/issue/DEXP-913018
You may workaround it for now by invoking Solution -> Add -> Existing folder, select your godot folder.