Adapt WebApi to latest changes in the registry

[johannesduesing]

Reason for this PR
The API of the Instance Registry has been change lately. The goal was to support new UI requirements. The relevant changes are:

• /matchingInstance and /matchingResult now require an additional parameter containing the caller-Id
• The Instance now has a new attribute called labels of type List[String]

This PR adapts the WebApi to support the new API version. The same has been done for the crawler here.

Changes

• Added attribute labels: List[String] to case class Instance
• Changed calls to /matchingInstance and /matchingResult to post the parameter callerId as well

[codecov]

Codecov Report

Merging #33 into develop will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           develop     #33      +/-   ##
==========================================
- Coverage     1.58%   1.58%   -0.01%     
==========================================
  Files           14      14              
  Lines          378     379       +1     
  Branches        22      28       +6     
==========================================
  Hits             6       6              
- Misses         372     373       +1

Impacted Files	Coverage Δ
...la/de/upb/cs/swt/delphi/webapi/Configuration.scala	0% <ø> (ø)	⬆️
...pb/cs/swt/delphi/instancemanagement/Instance.scala	0% <0%> (ø)	⬆️
...t/delphi/instancemanagement/InstanceRegistry.scala	0% <0%> (ø)	⬆️

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