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.

model/scheme.go

@@ -29,6 +29,10 @@ type Scheme struct {
 	DefaultChannelUserRole  string `json:"default_channel_user_role"`
 }
 
+type SchemeIDPatch struct {
+	SchemeID *string `json:"scheme_id"`
+}
+
 func (scheme *Scheme) ToJson() string {
 	b, _ := json.Marshal(scheme)
 	return string(b)
@@ -93,3 +97,14 @@ func (scheme *Scheme) IsValidForCreate() bool {
 
 	return true
 }
+
+func SchemeIDFromJson(data io.Reader) *string {
+	var p *SchemeIDPatch
+	json.NewDecoder(data).Decode(&p)
+	return p.SchemeID
+}
+
+func (p *SchemeIDPatch) ToJson() string {
+	b, _ := json.Marshal(p)
+	return string(b)
+}