fix: allow referencing events from interfaces

[charles-cooper]

allow the following:

import bar as Bar

@external
def foo():
    log Bar.SomeEvent(...)

What I did

How I did it

allow interfaces to resolve to events in get_type_from_node for interface members.

How to verify it

see usage in ERC20.vy and ERC721.vy

Commit message

Commit message for the final, squashed PR. (Optional, but reviewers will appreciate it! Please see our commit message style guide for what we would ideally like to see in a commit message.)

Description for the changelog

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[codecov-commenter]

Codecov Report

Merging #2852 (57ca6fe) into master (efe1dbe) will decrease coverage by 35.64%.
The diff coverage is 40.00%.

@@             Coverage Diff             @@
##           master    #2852       +/-   ##
===========================================
- Coverage   87.65%   52.00%   -35.65%     
===========================================
  Files          94       94               
  Lines       10179    10181        +2     
  Branches     2503     2453       -50     
===========================================
- Hits         8922     5295     -3627     
- Misses        791     4275     +3484     
- Partials      466      611      +145     

Impacted Files	Coverage Δ
vyper/semantics/validation/annotation.py	55.69% <0.00%> (-36.71%)	⬇️
vyper/semantics/types/user/interface.py	42.85% <37.50%> (-40.48%)	⬇️
vyper/semantics/validation/utils.py	50.86% <100.00%> (-40.44%)	⬇️
vyper/builtin_functions/utils.py	0.00% <0.00%> (-100.00%)	⬇️
vyper/builtin_interfaces/ERC165.py	0.00% <0.00%> (-100.00%)	⬇️
vyper/builtin_interfaces/ERC20Detailed.py	0.00% <0.00%> (-100.00%)	⬇️
vyper/ir/s_expressions.py	5.88% <0.00%> (-88.24%)	⬇️
vyper/ast/natspec.py	12.34% <0.00%> (-86.42%)	⬇️
vyper/codegen/external_call.py	12.74% <0.00%> (-83.34%)	⬇️
vyper/codegen/self_call.py	18.18% <0.00%> (-77.28%)	⬇️
... and 63 more

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[charles-cooper]

so this is a bit more complicated, since i removed the requirement to implement all events in an interface:

E           web3.exceptions.ABIEventFunctionNotFound: ("The event 'Transfer' was not found in this contract's abi. ", 'Are you sure you provided the correct contract abi?')

but it seems wasteful to force copy-paste. maybe we should have some kind of exposes ERC20(Transfer, Approval) syntax?

[charles-cooper]

meeting notes: export any events that are logged in a contract

[charles-cooper]

superseded by #3663