Subtype Id registration moved to its own package (#1416)

* Allow repo packages to register subtypes and id prefixes. 
* Refactor out request authentication logic to a new package as a sibling to handler.

internal/servers/controller/auth/testing.go

@@ -0,0 +1,26 @@
+package auth
+
+import (
+	"context"
+
+	"github.com/hashicorp/boundary/internal/requests"
+	"github.com/hashicorp/boundary/internal/servers/controller/common"
+)
+
+// DisabledAuthTestContext is meant for testing, and uses a context that has
+// auth checking entirely disabled. Supported options: WithScopeId an WithUserId
+// are used directly; WithKms is passed through into the verifier context.
+func DisabledAuthTestContext(iamRepoFn common.IamRepoFactory, scopeId string, opt ...Option) context.Context {
+	reqInfo := RequestInfo{DisableAuthEntirely: true}
+	opts := getOpts(opt...)
+	reqInfo.scopeIdOverride = opts.withScopeId
+	if reqInfo.scopeIdOverride == "" {
+		reqInfo.scopeIdOverride = scopeId
+	}
+	reqInfo.userIdOverride = opts.withUserId
+	if reqInfo.userIdOverride == "" {
+		reqInfo.userIdOverride = "u_auth"
+	}
+	requestContext := context.WithValue(context.Background(), requests.ContextRequestInformationKey, &requests.RequestContext{})
+	return NewVerifierContext(requestContext, nil, iamRepoFn, nil, nil, opts.withKms, reqInfo)
+}