feat(internal/cli): Implement schema loaders for URL/SDL inputs

[kitten]

Resolve #142
Related to #76

Summary

This implements reusable loaders for GraphQL schemas from URLs and SDL/JSON files. It unifies the current logic that was used in the CLI and is placed in @gql.tada/internal so it's reusable for GraphQLSP.

The new loadFromURL loader also checks for schema support and enables the optional introspection features as needed.

Set of changes

• Remaining TODOs for current code are annotated (mostly around tsconfig handling)
• Implement loadFromSDL and loadFromURL with watchers
• Replace current CLI logic with loaders
• Clean up tsconfig resolving logic

[changeset-bot]

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Latest commit: f71e74a

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