Add method to update skill metadata fields

[Matt-From-AnswerRocket]

No description provided.

[Copilot]

Pull request overview

This PR adds a new GraphQL mutation method to enable updating individual metadata fields of copilot skills. This provides a more flexible alternative to updating entire skill objects by allowing targeted field updates.

• Added update_copilot_skill_field mutation operation accepting copilot ID, skill ID, field name, and field value
• Integrated the new mutation into the GraphQL schema and SDK operations layer
• Exposed the functionality through a public method in the Config class with proper documentation

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
answer_rocket/graphql/operations/copilots.gql	Added GraphQL mutation definition for updating copilot skill fields with required parameters
answer_rocket/graphql/schema.py	Registered the new mutation in the Mutation type field names and added field definition with proper type annotations
answer_rocket/graphql/sdk_operations.py	Implemented mutation operation function and added to Mutation class for SDK integration
answer_rocket/config.py	Added public method with complete documentation to expose the update functionality to SDK users

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