feat[tool]: add integrity hash to initcode

[charles-cooper]

What I did

How I did it

How to verify it

Commit message

this commit adds the integrity hash of the source code to the
initcode. it extends the existing cbor metadata payload in the
initcode, so that verifiers can compare the integrity hash to the
artifact produced by a source bundle.

the integrity hash is put in the initcode to preserve bytecode space of
the runtime code.

refactor:
- change existing `insert_compiler_metadata=` flag to the more generic
`compiler_metadata=None`, which is more extensible.

Description for the changelog

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[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.

Project coverage is 46.18%. Comparing base (03095ce) to head (22a8655).

Files with missing lines	Patch %	Lines
vyper/compiler/phases.py	88.88%	0 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (03095ce) and HEAD (22a8655). Click for more details.

HEAD has 139 uploads less than BASE

Flag	BASE (03095ce)	HEAD (22a8655)
	140	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4234       +/-   ##
===========================================
- Coverage   91.35%   46.18%   -45.18%     
===========================================
  Files         109      109               
  Lines       15641    15644        +3     
  Branches     3443     3444        +1     
===========================================
- Hits        14289     7225     -7064     
- Misses        920     7865     +6945     
- Partials      432      554      +122     

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