feat(core): add graphql support

[kiran94]

Postman added GraphQL support.

Changes

• Updated PostRequest to understand graphql mode
• Bump Version
• Added GraphQL case to test postman collection and updated test.py
• Updated the Extractor to ignore raw string graphql queries
  • It was having trouble with some of the graphql syntax ( I think giving false positives on env variables)
• Added Tests
  • There is some overlap between this and https://github.com/matkapi/postpy2/pull/12 for the dependencies as I wanted testing on this one also. Once one PR goes on, I will consolidate the other

Verification

• See/Run updated postman collection
• Added Unit Tests

[kiran94]

@matkapi This one also, Thanks

[matkapi]

@kiran94 please resolve conflicts i'll try to merge pull request immediately

[kiran94]

Thanks @matkapi :smile: