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/oidc/op.go

@@ -42,7 +42,6 @@ type Config struct {
 	DeviceAuth                        *DeviceAuthorizationConfig
 	DefaultLoginURLV2                 string
 	DefaultLogoutURLV2                string
-	Features                          Features
 	PublicKeyCacheMaxAge              time.Duration
 }
 
@@ -62,11 +61,6 @@ type Endpoint struct {
 	URL  string
 }
 
-type Features struct {
-	TriggerIntrospectionProjections bool
-	LegacyIntrospection             bool
-}
-
 type OPStorage struct {
 	repo                              repository.Repository
 	command                           *command.Commands
@@ -128,7 +122,6 @@ func NewServer(
 
 	server := &Server{
 		LegacyServer:               op.NewLegacyServer(provider, endpoints(config.CustomEndpoints)),
-		features:                   config.Features,
 		repo:                       repo,
 		query:                      query,
 		command:                    command,