Consider events during type-check "implements:"

[iamdefinitelyahuman]

What I did

During type checking. consider events when validating the implements statement.

How I did it

Expand the existing code for implements - most of the logic is just ported over from how we check functions.

How to verify it

Verify the test suite is still passing. This is already very well tested so I have not added further cases.

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[codecov-io]

Codecov Report

Merging #2283 (ed763b2) into master (4ac9e49) will decrease coverage by 0.07%.
The diff coverage is 64.10%.

@@            Coverage Diff             @@
##           master    #2283      +/-   ##
==========================================
- Coverage   85.44%   85.37%   -0.08%     
==========================================
  Files          84       84              
  Lines        8591     8614      +23     
  Branches     2075     2083       +8     
==========================================
+ Hits         7341     7354      +13     
- Misses        748      756       +8     
- Partials      502      504       +2     

Impacted Files	Coverage Δ
vyper/context/types/meta/event.py	75.47% <44.44%> (-7.14%)	⬇️
vyper/context/types/meta/interface.py	77.45% <70.00%> (-1.62%)	⬇️

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