IAM: Create Service Account API and legacy store impl (#110411)
* wip
* IAM: Create Service Account
* Add dual writer
* Update openapi_test.go
* Add integration tests
* Add sql tests
* Add Role to SA spec, add validation, add DBTime, add tests
* Format, update test
* Fixes
* Add check for External
* Address feedback
* Update tests
* Address feedback
* make gen-go
* Simplify a bit
* Fixes
* make update-workspace
* Update pkg/registry/apis/iam/serviceaccount/store.go
Co-authored-by: Ryan McKinley <ryantxu@gmail.com>
* Address feedback, add test for generateName
---------
Co-authored-by: Ryan McKinley <ryantxu@gmail.com>