feat(api): feature flags (#7356)

* feat(api): feature API proto definitions

* update proto based on discussion with @livio-a

* cleanup old feature flag stuff

* authz instance queries

* align defaults

* projection definitions

* define commands and event reducers

* implement system and instance setter APIs

* api getter implementation

* unit test repository package

* command unit tests

* unit test Get queries

* grpc converter unit tests

* migrate the V1 features

* migrate oidc to dynamic features

* projection unit test

* fix instance by host

* fix instance by id data type in sql

* fix linting errors

* add system projection test

* fix behavior inversion

* resolve proto file comments

* rename SystemDefaultLoginInstanceEventType to SystemLoginDefaultOrgEventType so it's consistent with the instance level event

* use write models and conditional set events

* system features integration tests

* instance features integration tests

* error on empty request

* documentation entry

* typo in feature.proto

* fix start unit tests

* solve linting error on key case switch

* remove system defaults after discussion with @eliobischof

* fix system feature projection

* resolve comments in defaults.yaml

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/api/authz/instance_test.go

@@ -7,6 +7,8 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"golang.org/x/text/language"
+
+	"github.com/zitadel/zitadel/internal/feature"
 )
 
 func Test_Instance(t *testing.T) {
@@ -17,6 +19,7 @@ func Test_Instance(t *testing.T) {
 		instanceID string
 		projectID  string
 		consoleID  string
+		features   feature.Features
 	}
 	tests := []struct {
 		name string
@@ -56,6 +59,19 @@ func Test_Instance(t *testing.T) {
 				consoleID:  "consoleID",
 			},
 		},
+		{
+			"WithFeatures",
+			args{
+				WithFeatures(context.Background(), feature.Features{
+					LoginDefaultOrg: true,
+				}),
+			},
+			res{
+				features: feature.Features{
+					LoginDefaultOrg: true,
+				},
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -63,6 +79,7 @@ func Test_Instance(t *testing.T) {
 			assert.Equal(t, tt.res.instanceID, got.InstanceID())
 			assert.Equal(t, tt.res.projectID, got.ProjectID())
 			assert.Equal(t, tt.res.consoleID, got.ConsoleClientID())
+			assert.Equal(t, tt.res.features, got.Features())
 		})
 	}
 }
@@ -112,3 +129,7 @@ func (m *mockInstance) RequestedHost() string {
 func (m *mockInstance) SecurityPolicyAllowedOrigins() []string {
 	return nil
 }
+
+func (m *mockInstance) Features() feature.Features {
+	return feature.Features{}
+}