Adapt crawler to latest API change in 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 crawler to support the new API version.

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 #30 into develop will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           develop     #30      +/-   ##
==========================================
- Coverage     8.23%   8.22%   -0.02%     
==========================================
  Files           43      43              
  Lines         1153    1155       +2     
  Branches        27      34       +7     
==========================================
  Hits            95      95              
- Misses        1058    1060       +2

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

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