feat: adds inline value support

[karthiknadig]

Description (e.g. "Related to ...", etc.)

Adds support for inline value request.

Code review checklist (for code reviewer to complete)

• [x] Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• [x] Title summarizes what is changing
• [x] Commit messages are meaningful (see this for details)
• [x] Tests have been included and/or updated, as appropriate
• [x] Docstrings have been included and/or updated, as appropriate
• [x] Standalone docs have been updated accordingly

[tombh]

I think this completes support for inline values necessary for LSP 3.17 right? The tracking issue is at https://github.com/openlawlibrary/pygls/issues/346

[karthiknadig]

@tombh That is correct.

[tombh]

Thank you ⭐