Add Checks for Operation Definition in GraphQL Query

[desout]

This PR addresses missing checks for operation definitions in GraphQL queries.

Changes include:

1. Added condition to check if definition name is present then insert it into the props vector.
2. For cases where no operation type is provided, it defaults to "query".
3. Added logic to create all_definitions vector, and a check for presence of more than one definition. In case where a name is absent for any of these definitions, an appropriate error is thrown.

Lay the groundwork for further validation checks in GraphQL query processing based on the behavior of 'gajus/babel-plugin-graphql-tag' project.

While extensive testing has been done locally, it has not been fully covered by automated tests due to Rust experience constraints. Specifically, error/panic scenarios demand more test coverage.

This effort has mimicked necessary logic from an existing solution found at https://github.com/gajus/babel-plugin-graphql-tag/blob/master/test/fixtures/graphql-tag. The current changes seek to ensure similar, comprehensive validation checks in Rust implementation.
#21

[desout]

@rishabh3112 Hello, could you, please, take a look on this changes?

[rishabh3112]

@desout Thanks for PR! Left few comments.

[desout]

@rishabh3112 Hello, Where i can check your comments? :)

[desout]

@rishabh3112 Please review

[rishabh3112]

@desout will check and merge this weekend, thanks for contributions! Also, can you please change commits by using same email address as you have with github account? (for clearer commit history)

[desout]

@rishabh3112 Updated commits with proper email