feat(api): add generic oauth provider template (#5260)

adds functionality to manage templates based OIDC IDPs

internal/command/idp.go

@@ -2,6 +2,17 @@ package command
 
 import "github.com/zitadel/zitadel/internal/repository/idp"
 
+type GenericOAuthProvider struct {
+	Name                  string
+	ClientID              string
+	ClientSecret          string
+	AuthorizationEndpoint string
+	TokenEndpoint         string
+	UserEndpoint          string
+	Scopes                []string
+	IDPOptions            idp.Options
+}
+
 type GoogleProvider struct {
 	Name         string
 	ClientID     string