Add uid to few events (#9332)

# Which Problems Are Solved

When implementing simple stateless event processor, `the
user.grant.changed` bears too little information: just grant id and list
of role keys. This makes it impossible to change a users permissions
solely based on available role keys and requires to either:

- Store a mapping grant id -> user id, making a service stateful
- Make an extra call to zitadel to resolve user id by grant id (And it
doesn't seem that such an endpoint exists)

Same with `user.grant.removed` events.

# How the Problems Are Solved

Added `userId` field to `user.grant.changed` and `user.grant.removed`
events

# Additional Changes

`user.grant.removed` now has `projectId` and `grantId` as well

# Additional Context

- Closes #9113

internal/command/user_grant_test.go

@@ -1073,6 +1073,7 @@ func TestCommandSide_ChangeUserGrant(t *testing.T) {
 					expectPush(
 						usergrant.NewUserGrantChangedEvent(context.Background(),
 							&usergrant.NewAggregate("usergrant1", "org1").Aggregate,
+							"user1",
 							[]string{"rolekey1", "rolekey2"},
 						),
 					),
@@ -1167,6 +1168,7 @@ func TestCommandSide_ChangeUserGrant(t *testing.T) {
 					expectPush(
 						usergrant.NewUserGrantChangedEvent(context.Background(),
 							&usergrant.NewAggregate("usergrant1", "org1").Aggregate,
+							"user1",
 							[]string{"rolekey1", "rolekey2"},
 						),
 					),