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>

pkg/tests/apis/iam/testdata/user-test-create-v0.yaml

@@ -7,4 +7,5 @@ spec:
   email: testuser1@example123.com
   login: testuser1
   name: Test User 1
-  provisioned: false
+  provisioned: false
+