fix: improve error message for conflicting methods IDs

[trocher]

What I did

Fix again #3133 as it has been reverted by #2974.
Additionally, added a test for collisions of functions having 0x00000000 as ID.

How I did it

Similarly to #3134, modified validate_unique_method_ids so that it outputs both the signature of each function having a collision together with the collision id itself.

How to verify it

Trying to compile the following contract will now output the signature of the functions having a collision and the collision id:

@external
def OwnerTransferV7b711143(a : uint256) : 
    pass
@external
def withdraw(a : uint256):
    pass

• Before: Methods have conflicting IDs:
• Now: Methods produce colliding method ID '0x2e1a7d4d': OwnerTransferV7b711143(uint256), withdraw(uint256)

Commit message

fix: improve error message for conflicting methods IDs

Description for the changelog

Improve error message for conflicting methods IDs

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[codecov-commenter]

Codecov Report

Merging #3491 (1755b7c) into master (c90ab2f) will increase coverage by 0.01%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master    #3491      +/-   ##
==========================================
+ Coverage   89.35%   89.37%   +0.01%     
==========================================
  Files          84       84              
  Lines       10777    10778       +1     
  Branches     2456     2456              
==========================================
+ Hits         9630     9633       +3     
+ Misses        751      749       -2     
  Partials      396      396              

Impacted Files	Coverage Δ
vyper/semantics/analysis/utils.py	91.84% <100.00%> (+0.02%)	⬆️

... and 1 file with indirect coverage changes

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[charles-cooper]

lgtm, thank you!