Automatic request header support (#236)

* Automatic request header support

* Update proxy generator

* Remove incorrect tests which require resource-id changes

* Update with header annotations from api pr

* Rerun make, fix one test

* Fix generator bugs and improve test coverage

- Remove unused getPackageName() function
- Fix swallowed error in RangeFiles callback by capturing it in rangeErr
- Avoid redundant fmt.Sprintf("%s", val) when value template has no prefix
- Add tests for nil request, resource-id prefixes, nested fields, nil parents,
  deployment/taskqueue/schedule types, and empty namespace

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Update proto submodule to master and regenerate proxy code

Proto submodule now includes merged API PR #737 which standardizes
resource_id annotations to use bare values. Regenerated proxy code
passes resource_id values through without adding prefixes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Chad Retz <chad@temporal.io>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 3 people

cmd/proxygenerator/main.go

@@ -31,7 +31,12 @@ func main() {
 		log.Print(interceptorErr)
 	}
 
-	if serviceErr != nil || interceptorErr != nil {
+	requestHeaderErr := generateRequestHeader(cfg)
+	if requestHeaderErr != nil {
+		log.Print(requestHeaderErr)
+	}
+
+	if serviceErr != nil || interceptorErr != nil || requestHeaderErr != nil {
 		os.Exit(1)
 	}
 }