Ballerina client for interacting with the global data API

[samisa-abeysinghe]

Rather than having a central client, we will be using clients from each BFF
This way, the GQL client will only focus on the entities and processing logic related to the domain logic.
This is being done in the admissions applications BFF

The process to generate the GQL client is the following

1. Query the JSON schema from the GraphQL service
2. Convert JSON schema to IDL
   • graphql-introspection-json-to-sdl schema.json > schema.graphql
3. Point to schema IDL file from graphql.config.yaml
4. Create a file each for queries and mutations you want
5. Copy queries and mutations to relevant files
6. Point to those queries and mutations from graphql.config.yaml
7. Run the bal command
   • bal graphql -i graphql.config.yaml -o gd_client_src