feat: add java client

[strieflin]

No description provided.

[sbckr]

handling policy id prefix stackable/bundles/ seems inconsistent and inconvenient. Why not leaving it to the service at all?

[sbckr]

It is ignored if at least one provider has policies defined that are not present on other(s).
Should that be logged somehow? Is this considered okay?
It could be a common scenario if policies are updated (added or deleted) and changes are not yet reflected on all VCPs. However, an option to have this information printed allows debugging if policies are not enrolled properly

[strieflin]

This is now logged on debug level.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 34 lines in your changes missing coverage. Please review.

Project coverage is 80.00%. Comparing base (8284e69) to head (46c625f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ava/io/carbynestack/thymus/client/ThymusError.java	38.88%	11 Missing ⚠️
...io/carbynestack/thymus/client/ThymusVCPClient.java	83.92%	8 Missing and 1 partial ⚠️
.../io/carbynestack/thymus/client/PolicyResponse.java	62.50%	5 Missing and 1 partial ⚠️
.../io/carbynestack/thymus/client/ThymusEndpoint.java	69.23%	1 Missing and 3 partials ⚠️
.../io/carbynestack/thymus/client/NamespacedName.java	66.66%	1 Missing and 2 partials ⚠️
...ain/java/io/carbynestack/thymus/client/Policy.java	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master      #20       +/-   ##
=============================================
+ Coverage     61.65%   80.00%   +18.34%     
- Complexity        0       47       +47     
=============================================
  Files             3        7        +4     
  Lines           133      170       +37     
  Branches          0       12       +12     
=============================================
+ Hits             82      136       +54     
+ Misses           41       26       -15     
+ Partials         10        8        -2     

Flag	Coverage Δ
java-client	80.00% <80.00%> (?)
services	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
.../io/carbynestack/thymus/client/ThymusVCClient.java	100.00% <100.00%> (ø)
...ain/java/io/carbynestack/thymus/client/Policy.java	66.66% <66.66%> (ø)
.../io/carbynestack/thymus/client/NamespacedName.java	66.66% <66.66%> (ø)
.../io/carbynestack/thymus/client/ThymusEndpoint.java	69.23% <69.23%> (ø)
.../io/carbynestack/thymus/client/PolicyResponse.java	62.50% <62.50%> (ø)
...io/carbynestack/thymus/client/ThymusVCPClient.java	83.92% <83.92%> (ø)
...ava/io/carbynestack/thymus/client/ThymusError.java	38.88% <38.88%> (ø)

... and 3 files with indirect coverage changes

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[sbckr]

LGTM

[sbckr]

LGTM