Add Graphql support for stored procedure

[abhishekkumams]

Why make this change?

• e.g. Closes [GraphQL] Stored Procedure support for Engine #869
• It will allow executing Stored-procedures through GraphQL requests.

What is this change?

• Updating GraphQLSchemaGenerator to support creation of StoredProcedures Schema.
• Updated the MsSqlCommands to add some new stored procedure, one for each type of CRUD operations.
• Using the ColumnDefinition in SourceDefintion class to store stored-procedure result set definition.
• Created a new class GraphQLStoredProcedureBuilder, which helps in generating stored procedure schema by building arguments from parameters and result set
• StoredProcedures only supports one CRUD action as of now.
• StoredProcedure with Read action goes to Query, while other CRUD actions makes it mutation operation on graphQL.
• QueryBuilder: it checks if the object type is StoredProcedure, generates the query with Same name
• MutationBuilder works similarly, it just checks if it has any of the action except READ, and adds it to mutation fields.
• Currently we only support simple Stored-Procedure,i.e. stored procedure that requires only 1 CRUD action to execute.
• If the stored-procedure having create permission is also trying to READ, results won't be displayed, but execution of stored procedure will still happen
• Wrote validation to check all the parameters are provided in the config that are in db. (will update it to not be mandatory once we figure out an efficient way to find default values).
• We also do a check the runtime config for stored-procedure to have exactly 1 CRUD action.
• Updated MsSQLbooks.sql as well to have the new stored-procedures
• Did some code refining
• For complete design doc, refer: updating stored-procedure design doc #896

To Be Addressed in Separate PR (issue: #989 ):

1. To fetch parameters information from DB, like parameter type, their default value.
2. parameter type for correct parsing of the value
3. default parameter value so that if not provided in the config, we still generate the correct graphQL schema

How was this tested?

• unit tests
• Integration Tests

Sample Request(s)

Insert (Mutation)

Count (Query)

Update(Mutation)

Delete(Mutation)

Select (Query)

[ayush3797]

Thanks, @abhishekkumams for addressing all the review comments promptly. Great work! LGTM!

[severussundar]

LGTM!