feat: Support glob pattern and absolute path for schema

[h-kishi]

Support glob pattern and absolute path for schema as well as sid88in/serverless-appsync-plugin#399 .

custom:
  appSync:
    schema:
      - path/**/*.graphql
      - /path/to/schema.graphql

[bboure]

🚀 Thank you again @h-kishi 🙏

[bboure]

@all-contributors add @h-kishi for code

[allcontributors]

@bboure

I've put up a pull request to add @h-kishi! 🎉

[bboure]

🎉 This PR is included in version 0.14.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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