Add data sources to ruletype API

[JAORMX]

Summary

This adds the ability for the eval engine to reference data sources to
be instantiated. this allows us to explicitly declare what data sources
a rule type needs which will in turn be used to keep track of
dependencies.

Only declared ruletypes will be registered in the per-rule data source
registry.

Data sources are declared in ruletypes by name. The API was built in a
way that we can eventually add other reference means other than names;
but names will do for now.

Note that name validation was also changed to reflect that we only
accept lowercase characters for data source names.

Change Type

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• Bug fix (resolves an issue without affecting existing features)
• Feature (adds new functionality without breaking changes)
• Breaking change (may impact existing functionalities or require documentation updates)
• Documentation (updates or additions to documentation)
• Refactoring or test improvements (no bug fixes or new functionality)

Testing

Outline how the changes were tested, including steps to reproduce and any relevant configurations.
Attach screenshots if helpful.

Review Checklist:

• Reviewed my own code for quality and clarity.
• Added comments to complex or tricky code sections.
• Updated any affected documentation.
• Included tests that validate the fix or feature.
• Checked that related changes are merged.

[coveralls]

coverage: 54.63% (-0.001%) from 54.631%
when pulling 24f8f46 on JAORMX:ruletype-datasources
into 3cc4ae8 on mindersec:main.