Add enum parameter to number and integer schema methods

[jondavidschober]

Adds enum support for numeric schema builders, including integer and number examples/spec coverage.\n\nCloses #30

[jondavidschober]

I'm not sure about this PR now. I cant find where enum is defined in the spec, but the bedrock API didnt seem to like having enum on number

[diegocostares]

Hi! Is there any update on this? I started a thread about the same thing on the #30

[crmne]

enum is defined by JSON Schema as a validation keyword for any instance type, not only strings:

https://json-schema.org/draft/2020-12/json-schema-validation#section-6.1.2

The spec says the value must be an array, and an instance is valid if it equals one of the array elements. Those elements can be any JSON type, so integer and number enums are valid JSON Schema.

This PR looks complete for the runtime DSL behavior. number and integer already forward **options into number_schema / integer_schema, so adding enum: there is enough to make the API work.

What I’d still like before merge:

• Add specs in spec/ruby_llm/schema/properties/numbers_spec.rb for integer :level, enum: [0, 1, 2]
• Add a spec for number :score, enum: [0.5, 1.5]
• Optionally update the README Numbers section to mention enum
• Add Closes #30 to the PR description

No further implementation changes look necessary.

[crmne]

As mentioned in the previous comment

[crmne]

All requested changes are addressed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.79%. Comparing base (8861130) to head (861f300).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #29   +/-   ##
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  Coverage   94.79%   94.79%           
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  Files          12       12           
  Lines         365      365           
  Branches       73       73           
=======================================
  Hits          346      346           
  Misses         19       19           

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