Fix printing of symbol in CLS when hovering

[jabraham17]

Fixes an issue where hovering over a primary method would just show this. Now it will show the method name properly. Along the way, I also added the type name for secondary methods (and primary methods when resolution is enabled)

In this PR:

• added hash and rich comparison to AstNode in chapel-py
• added is_this to Formal in chapel-py
• used the new comparison ops for AstNode to improve code quaility
• fixed hovering over a primary method
• improved printing of a secondary method by adding the type name
• improved printing of a primary method by adding the type name (only when resolution is enabled). This only works well when the type/method is fully concrete, because there is no way to compute an instantiation from a hover. In the future, it would be nice to be able to show the generic-ness of the type.
• fixes an issue with the venv install for test-cls

Before

After

• make test-cls

[Reviewed by @DanilaFe]

[DanilaFe]

parentAst is notoriously expensive. Have you found issues with literally checing if name == USTR("this")?

[jabraham17]

I don't think there is any issue with that, since the parser prevents it from being used in any Formal name context

[DanilaFe]

Could you do:

        for (i, part) in enumerate(self._signature):
            tag = part.tag
            node = part.node
            value = part.value
            prefix = part.prefix or ""
            postfix = part.postfix or ""

Then, I suggest in-lining the variables only used a handful of times (looks like tag and value)

[jabraham17]

I inlined tag (used once), but left value since its twice (same as node)