feat(jest,rstest): add padding rules

[elecmonkey]

Summary

Add seven focused padding rules and padding-around-all for both Jest and Rstest.
Share the padding engine while keeping framework-specific API tables, tests, and documentation.

Intentional limitations

• Namespace-qualified and renamed API calls are not matched because classification follows first-token syntax.
• Rstest excludes Jest-only aliases and expectTypeOf.

Related Links

Related #476.
Related #935.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[fansenze]

[P2] Adding a warning rule can make failing lint pass

Enable these two rules:

rules: {
  'jest/padding-around-before-all-blocks': 'warn',
  'jest/padding-around-before-each-blocks': 'error',
}

Then lint two hooks with no blank line between them:

beforeAll(connect);
beforeEach(reset);

• Expected: The missing blank line before beforeEach produces an error. Exit code: 1.
• Actual: Only the beforeAll warning is reported. Exit code: 0.

Turning the first rule off restores the error. In other words, adding a warning rule makes code that previously failed lint pass.

Both rules detect the same missing blank line, but deduplication keeps the warning and drops the error. Rstest has the same problem. Please retain the error when these reports overlap and add a regression test for this configuration.