- add: roles to user

- add: register calls for auth server
- add: user lookup by email
- add: start of password reset
- add: Cache trait to allow redis cache mocking

proto/database.proto

@@ -6,6 +6,7 @@ service DatabaseService {
     rpc GetUser(GetUserRequest) returns (GetUserResponse);
     rpc CreateUser(CreateUserRequest) returns (CreateUserResponse);
     rpc GetUserByUsername(GetUserByUsernameRequest) returns (GetUserResponse);
+    rpc GetUserByEmail(GetUserByEmailRequest) returns (GetUserResponse);
 }
 
 message GetUserRequest {
@@ -16,11 +17,16 @@ message GetUserByUsernameRequest {
     string username = 1;
 }
 
+message GetUserByEmailRequest {
+    string email = 1;
+}
+
 message GetUserResponse {
     int32 user_id = 1;
     string username = 2;
     string email = 3;
     string hashed_password = 4;
+    repeated string roles = 5;
 }
 
 message CreateUserRequest {