feat: Add function_name override for endpoints and mutations

[pranav-new-relic]

Summary

Adds optional function_name field to endpoint and mutation configurations to resolve naming conflicts when multiple endpoints share the same GraphQL field name but exist at different query paths.

Problem

When two queries use endpoints with the same name (e.g., both named workflow), tutone generates conflicting Go functions with identical names, causing compilation errors.

Solution

• Added function_name field to EndpointConfig and MutationConfig
• When specified, overrides the generated Go function name while keeping the GraphQL query unchanged
• Response types are also renamed to match the custom function name

Example Usage

queries:
  - path: ["actor", "account", "workflowAutomation"]
    endpoints:
      - name: workflow
        function_name: accountWorkflow
        max_query_field_depth: 2
  - path: ["actor", "organization", "workflowAutomation"]
    endpoints:
      - name: workflow
        function_name: organizationWorkflow
        max_query_field_depth: 2

Generates:

func (a *Package) GetAccountWorkflow(...) (*AccountWorkflowResponse, error)
func (a *Package) GetOrganizationWorkflow(...) (*OrganizationWorkflowResponse, error)

Testing

• ✅ Successfully compiles with go build
• ✅ Backward compatible (field is optional)

🤖 Generated with Claude Code