Add Camino schema interfaces

proto/camino/options.proto

@@ -15,6 +15,8 @@ extend google.protobuf.MessageOptions {
   ClassOptions class = 51010;
   repeated MethodOptions method = 51011;
   repeated MigrationOptions migration = 51012;
+  InterfaceOptions interface = 51013;
+  repeated ImplementsOptions implements = 51014;
 }
 
 extend google.protobuf.FieldOptions {
@@ -22,6 +24,7 @@ extend google.protobuf.FieldOptions {
   EdgeOptions edge = 51021;
   FieldStorage field_storage = 51022;
   FieldOps field_ops = 51023;
+  InterfaceFieldContract interface_field = 51024;
 }
 
 extend google.protobuf.MethodOptions {
@@ -33,6 +36,16 @@ message ClassOptions {
   SymbolRef id = 2;
 }
 
+message InterfaceOptions {
+  uint32 version = 1;
+  SymbolRef id = 2;
+}
+
+message ImplementsOptions {
+  SymbolRef interface = 1;
+  repeated TypeBinding type_binding = 2;
+}
+
 message EdgeOptions {
   SymbolRef id = 1;
   SymbolRef target = 2;

proto/camino/schema.proto

@@ -79,6 +79,7 @@ message ClassSchema {
   string source_file = 7;
   string proto_message = 8;
   repeated OperationServiceSchema operation_services = 9;
+  repeated InterfaceImplementationSchema implements = 10;
 }
 
 message FieldSchema {
@@ -90,6 +91,7 @@ message FieldSchema {
   bool optional = 6;
   FieldStorage storage = 7;
   FieldOps ops = 8;
+  InterfaceFieldContract interface_contract = 9;
 }
 
 message FieldStorage {
@@ -103,6 +105,33 @@ message TypeRef {
   SymbolRef symbol = 2;
 }
 
+message TypeBinding {
+  string name = 1;
+  TypeRef type = 2;
+}
+
+message InterfaceFieldContract {
+  bool required = 1;
+  bool readable = 2;
+  bool writable = 3;
+  bool watchable = 4;
+  string type_param = 5;
+  TypeRef type = 6;
+}
+
+message InterfaceImplementationSchema {
+  SymbolRef interface = 1;
+  repeated TypeBinding type_bindings = 2;
+}
+
+message InterfaceSchema {
+  SymbolRef id = 1;
+  uint32 version = 2;
+  repeated FieldSchema fields = 3;
+  string source_file = 4;
+  string proto_message = 5;
+}
+
 enum FieldImplementation {
   FIELD_IMPLEMENTATION_UNSPECIFIED = 0;
   SERVICE = 1;