MM-10182 & MM-10183: Adds channel scheme and team scheme API endpoint. (#8680)

* MM-10183: Adds channel scheme API endpoint.

MM-10182: Adds team scheme API endpoint.

MM-10182_3: Switch from scheme_id in path to body.

* MM-10182/MM-10183: Changes path from 'schemes' to 'scheme'.

* MM-10182: Fix merge error.

i18n/en.json

@@ -2506,6 +2506,14 @@
     "id": "api.team.update_team.permissions.app_error",
     "translation": "You do not have the appropriate permissions"
   },
+  {
+    "id": "api.team.update_team_scheme.license.error",
+    "translation": "License does not support updating a team's scheme"
+  },
+  {
+    "id": "api.team.update_team_scheme.scheme_scope.error",
+    "translation": "Unable to set the scheme to the team because the supplied scheme is not a team scheme."
+  },
   {
     "id": "api.templates.channel_name.group",
     "translation": "Group Message"
@@ -6694,6 +6702,14 @@
     "id": "api.channel.update_team_member_roles.scheme_role.app_error",
     "translation": "The provided role is managed by a Scheme and therefore cannot be applied directly to a Team Member"
   },
+  {
+    "id": "api.channel.update_channel_scheme.license.error",
+    "translation": "License does not support updating a channel's scheme"
+  },
+  {
+    "id": "api.channel.update_channel_scheme.scheme_scope.error",
+    "translation": "Unable to set the scheme to the channel because the supplied scheme is not a channel scheme."
+  },
   {
     "id": "store.sql_channel.get_by_scheme.app_error",
     "translation": "Unable to get the channels for the provided scheme"