[WIP] Add metadata to advise results

[mayaCostantini]

Related Issues and Dependencies

Related to #2180

• make sure adviser provides tags/categories in metadata

This introduces a breaking change

• Yes

Needs User API schema revision.

This should yield a new module release

• Yes

This Pull Request implements

Keep advise metadata in report (number of packages added / removed, number of justifications, advise id, stack_info count).
This Pull Request is a WIP and needs further testing.

If any metadata that it would be interesting to have is missing, please add it in a comment.

[sesheta]

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[sesheta]

@mayaCostantini: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
aicoe-ci/prow/pytest	fd5beef	link	true	/test thoth-pytest-py38
aicoe-ci/prow/pre-commit	fd5beef	link	true	/test pre-commit

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[mayaCostantini]

Closing this PR due to change of approach in the clustering of advise results.