feat: project member & invites endpoint with additional fields

[dpkshrma]

Added/updated following endpoints to get user information with additional data:

1. project member by id
2. list of all invites inside the project
3. authenticated user invite details

[maxceem]

Thanks for PR @dpkshrma.

Code looks good, but there is a couple of issues.

1. If I put some non-existent values to the fields list I guess them in response with null values. But if the field is not supported it should be ignored and I shouldn't get anything in the response for that field:

   

2. It looks like fields that should come from the traits are never returned.
   For example, I'm requesting project members and one of the user is pshah_manager which has photoURL,, but I get null in response:

   

   Even though, if I retrieve the traits of pshah_manger I can see it has photoURL:

   

   The same thing with workingHourStart,workingHourEnd,timeZone. For example, I invite user maxceem8 which has all of them defined in traits:

   

   But if I get a list of invitation with this user, I get null values for workingHourStart,workingHourEnd,timeZone:

   

3. Endpoint for getting individual invite looks like don't return additional fields, and always returns null:

   

4. Endpoint for getting an individual invite now return multiple duplicate records:

   

[maxceem]

Thanks for timely update @dpkshrma.

All the previous issues are fixed, only a few small issues left:

1. Endpoint for an individual invite return an array with one invite, though previously it returned one invite object:
   now:
   

   before:
   

2. Endpoint for getting one member should return error 404 when a member is not found, the same way as we do in all other endpoints, for example https://github.com/topcoder-platform/tc-project-service/blob/dev/src/routes/phases/get.js#L20-L26

[maxceem]

Thanks, @dpkshrma. All works great now.