Fix/graphql file load

[lohxt1]

Description

this pr adds support to load files containing either the introspection query or the type definitions.

(similar pr #2322 )

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

graphql_file_load.mov

meta {
  name: spacex
  type: graphql
  seq: 1
}

post {
  url: https://spacex-production.up.railway.app/
  body: graphql
  auth: none
}

body:graphql {
  {
    company {
      ceo
    }
  }
  
}

sample_data.zip