raise warning when EIP-170 contract size limit is exceeded

[lr4d]

What I did

Fixes #2150

Still to-do according to #2150 (comment):

The warning should also give suggestions about how to fix the problem (reducing interactions in the constructor, reducing state variables, breaking apart contracts, etc.)

I'm not too familiar with the internals yet, so would appreciate suggestions on the suggestions to be provided.

How I did it

How to verify it

Description for the changelog

Cute Animal Picture

[codecov-io]

Codecov Report

Merging #2208 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2208      +/-   ##
==========================================
+ Coverage   85.31%   85.36%   +0.04%     
==========================================
  Files          83       84       +1     
  Lines        8525     8533       +8     
  Branches     2063     2064       +1     
==========================================
+ Hits         7273     7284      +11     
+ Misses        745      743       -2     
+ Partials      507      506       -1     

Impacted Files	Coverage Δ
vyper/compiler/output.py	100.00% <100.00%> (ø)
vyper/warnings.py	100.00% <100.00%> (ø)
vyper/functions/functions.py	89.81% <0.00%> (+0.39%)	⬆️

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[iamdefinitelyahuman]

Thanks! 🚀

[fubuloubu]

Looks good! Some minor nits

[lr4d]

btw you will also want to close #1850, which is a duplicate of #2150

[fubuloubu]

@lr4d thanks for seeing that!