Add Signup to Rest API

[krestenlaust]

Increments API version from 1.1 to 1.1.1

Resolves #542
Prerequisite: #550

Documentation:

• Add [POST] /api/signup for posting signups
• Add [GET] /api/signup/status for querying status regarding a signup

Implementation:

• [POST] /api/signup
• [GET] /api/signup/status

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.80%. Comparing base (a02bfdb) to head (b7df05b).
Report is 4 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #543   +/-   ##
=======================================
  Coverage   80.80%   80.80%           
=======================================
  Files          40       40           
  Lines        3809     3809           
  Branches      481      481           
=======================================
  Hits         3078     3078           
  Misses        675      675           
  Partials       56       56           

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[krestenlaust]

I made the mistake to make signups lookup-able by ID, let's avoid this, and only lookup signup status by username