Add sortText depending scope of symbols

[sheetalkamat]

Fixes #15024

Sorting done as per #15024 (comment)
Sorting as per #15024 (comment) is more complicated and needs more thought so for now enabling simple sorting.

1. Things from the lexical scope that are declared in the current file (including top-level variables in a script file)
2. Suggested class members
3. Things from global lexical scope and keywords
4. Auto-import suggestions
5. JavaScript identifiers

[weswigham]

The linked vscode issue mentioned something about a "location bonus" - is that further refining the order of zero-ranked completions on the vscode side by using brace matching and proximity?

[sheetalkamat]

@weswigham yes