ValueConstraint: Assert column values in set

[pecop2]

Description

IN operator, new field for the set in ValueConstraintMsg, checks for value errors, adapting to_protobuf and from_protobuf.
Function columnValuesInSetConstraint() and tests for the changes

General Checklist

• Tests added for this feature/bug
  if it was a bug, test must cover it.
• Conform by the style guides, by using formatter
• Documentation updated
• (optional) Please add a label to your PR

[coveralls]

Pull Request Test Coverage Report for Build 1581390881

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 18 of 21 (85.71%) changed or added relevant lines in 1 file are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.009%) to 80.158%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/whylogs/core/statistics/constraints.py	18	21	85.71%

Files with Coverage Reduction	New Missed Lines	%
src/whylogs/core/statistics/constraints.py	1	67.71%
src/whylogs/proto/constraints_pb2.py	2	65.75%

Totals
Change from base Build 1580713708:	0.009%
Covered Lines:	3744
Relevant Lines:	4536

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💛 - Coveralls

[jamie256]

Looks good, (pending Richard's comments are addressed), and the tests are nice! I left a few questions and comments.