More elegant way to generate arrays of keys from a type with full type safety

[cte]

Description

Minor type cleanup.

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Important

Refactor key generation for types using keysOf for improved type safety and maintainability.

• Type Safety:
  • Introduces keysOf<T>() in type-fu.ts to create type-safe key arrays, ensuring all keys from type T are present.
• Refactoring:
  • Replaces manual key arrays with keysOf in global-settings.ts, provider-settings.ts, and index.test.ts.
  • Removes redundant GlobalSettingsRecord, SecretStateRecord, and ProviderSettingsRecord.
• Testing:
  • Updates test command in index.test.ts to use --globals flag.

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