feat[tool]: improvements to AST annotation

[charles-cooper]

What I did

some improvements to AST annotation, including

• link to declnode for user types
• improve path information for modules
• sha256sum for modules
• include path resolution information on Import* nodes
• tests

i also removed some dead code as i came across it. compare_nodes is only used in a couple tests, and those can be rewritten with the __eq__() operator. i'm not very thrilled about the idea of node equality in general as it's a bit ill-defined (what exactly do we want to measure?) and i think we should try to move away from defining/relying on node equality at all.

along with #3790, should fix #3600

How I did it

How to verify it

Commit message

this commit enriches the annotated AST output so that links between
nodes are explicit and consumers of the AST do not need to "guess" about
relationships.

- link to the type declaration node for user types
- add `sha256sum` field for `Module` nodes
- add fields on `Import*` nodes so that they can be linked directly to
  `Module` nodes (including `sha256sum`, so that changes in dependencies
  can be detected)
- add improved type information (including parsed out metadata, like
  array length) consistently across all types.

misc/refactors:
- add `to_dict()` for type objects
- removed some dead code - `compare_nodes` was only used in a couple of
  tests, and node equality could be used there instead. (node equality
  is not super well-defined, but we could revisit that later).

Description for the changelog

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.75000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 69.69%. Comparing base (5825e12) to head (e9c8f32).
Report is 1 commits behind head on master.

❗ Current head e9c8f32 differs from pull request most recent head a8fda55. Consider uploading reports for the commit a8fda55 to get more accurate results

Files	Patch %	Lines
vyper/semantics/analysis/module.py	57.14%	3 Missing ⚠️
vyper/ast/nodes.py	87.50%	1 Missing and 1 partial ⚠️
vyper/semantics/analysis/base.py	91.66%	0 Missing and 1 partial ⚠️
vyper/semantics/types/module.py	90.90%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3829       +/-   ##
===========================================
- Coverage   86.15%   69.69%   -16.46%     
===========================================
  Files          92       92               
  Lines       13921    13990       +69     
  Branches     3067     3075        +8     
===========================================
- Hits        11993     9751     -2242     
- Misses       1491     3570     +2079     
- Partials      437      669      +232     

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[cyberthirst]

Shouldn't AdressT, SelfT, HashMapT have typeclass assigned?

[charles-cooper]

Shouldn't AdressT, SelfT, HashMapT have typeclass assigned?

i found it not very useful (especially for AddressT and SelfT) because the typeclass is the same as the type name. but maybe yea we should add it for hashmap