feat: add custom fragment import helpers and remove @graphql-fragment…

[asonnleitner]

…-import dependency

• Added new helper modules for inlining and gathering GraphQL fragments:
  • gather-fragment-imports.ts to fetch and parse all direct and transitive imports from the source.
  • inline-imports.ts to inline import statements within GraphQL files.
  • match-import.ts to match import statements in GraphQL files.
• Removed the dependency on @graphql-fragment-import/lib by implementing custom fragment import logic.
• Updated inlineFragments function to utilize the new inlineImportsWithLineToImports.
• Modified package-lock.json and package.json to reflect these changes.

The new implementation provides more control over the fragment import process and reduces external dependencies.

[dulnan]

Thank you so much! I tested it locally and it works perfectly. I'm going to merge this as is and then see if it would be possible to reuse it to also handle the "automatic inlining", which I've now implemented in a (probably) not very efficient way.