feat(eslint-plugin): add signals rules

[timdeschryver]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Closes #4379

What is the new behavior?

Does this PR introduce a breaking change?

[x] Yes
[ ] No

Commit c2e17d3 further simplifies the eslint configuration.
I think this makes more sense to separate the rules by package, because the differences are too small to split things further up.

Other information

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[markostanimirovic]

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