feat: add new relic rules and improve sentry rules

[didroe]

Description

ref: #366

Improve Ruby rules:

• Adds rules for New Relic
• Adds additional rules for Sentry

Also improves runtime for integration tests by only loading the specific rule for each test. As part of this, we incidentally fix the following:

• When using --only-rule, include associated auxiliary rules
• Make external rules use the same format as default rules

Checklist

• I've added test coverage that shows my fix or feature works as expected.
• I've updated or added documentation if required.
• I've included usage information in the description if CLI behavior was updated or added.
• PR title follows Conventional Commits format