[Just for running test] Some auto completion improvement

[Tangent-90]

Description

• Support #16562 for C# style extension methods

• When caret is after = or <>, show static field or property of the former expr type. These static things is of same type with the former expr.

• Complete the parameter list of the overrided method and call base method

Current questions:

1. Cannot trigger the new completion context in many case

• When the = expr not the last expr:

• Inside the if .. then .. (but it can trigger if there is no then)

• In arguments list

• There's some thing after the operator

2. Can only trigger completion when the caret is right after the operator, and there is a space right after the operator

~3. Properties cannot be distinguished from methods~

6. Completions in ~interface implementation or~ obj expr will not exclude items already overrided

~7. Completions in interface implementation will also give overridable members from obj~

~8. Completions doesnot insert correct type when the parameter list containing generic~

9. Extension methods from getAllSymbols maybe duplicated

10. Extension methods from getAllSymbols is not detailed

Extensions from opened namespace:

Extensions from getAllSymbols:

Checklist

• [ ] Test cases added
• [ ] Performance benchmarks added in case of performance changes
• [ ] Release notes entry updated:

[github-actions[bot]]

:heavy_exclamation_mark: Release notes required

@Tangent-90,

[!CAUTION] No release notes found for the changed paths (see table below).

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Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/8.0.400.md	No release notes found or release notes format is not correct
vsintegration/src	docs/release-notes/.VisualStudio/17.11.md	No release notes found or release notes format is not correct

[Tangent-90]

I think I need some help to solve these questions.