feat(rest): auth improvements

[TimoGlastra]

Refactors the auth implementation so that it is handled as auth internally (easiest with TSOA), but isn't advertised as auth, every request now has a x-tenant-id header param that you can provide

If incorrect x-tenant-id value was provided you will get a bad request error.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.95%. Comparing base (d09b153) to head (73632e4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #263      +/-   ##
==========================================
+ Coverage   57.91%   57.95%   +0.03%     
==========================================
  Files          94       95       +1     
  Lines        2526     2528       +2     
  Branches      512      513       +1     
==========================================
+ Hits         1463     1465       +2     
  Misses        983      983              
  Partials       80       80              

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