Add support for managing client-policies

[thomasdarimont]

What this PR does / why we need it:
Adds support for managing client-profiles.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

fixes #863

Special notes for your reviewer:

Some executors such as secret-rotation in client-policies are only available in recent Keycloak versions.

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR
• add tests for client-policy profiles referencing profiles
• add tests for client-policy policies referencing profiles
• document client-policy support

[thomasdarimont]

@st3v0rr I think the current CI build failures are unrelated to this PR, would you mind taking a look?

All test runs fail with this test:

...
Error: org.jboss.resteasy.client.jaxrs.internal.proxy.extractors.BodyEntityExtractor#extractEntity: HTTP 404 Not Found
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.498 s <<< FAILURE! - in de.adorsys.keycloak.config.mock.CookieMockIT
[ERROR] de.adorsys.keycloak.config.mock.CookieMockIT.run  Time elapsed: 0.239 s  <<< ERROR!
javax.ws.rs.NotFoundException: HTTP 404 Not Found
	at de.adorsys.keycloak.config.mock.CookieMockIT.run(CookieMockIT.java:77)
...
	````

[thomasdarimont]

@st3v0rr I think this PR is ready now for review, would you mind taking a look?

[thomasdarimont]

@st3v0rr once #861 is merged (with the fix for the build errors) we can rebase and add this PR too.

[thomasdarimont]

@st3v0rr I just noticed that I forgot to click "ready for review". I just updated the PR. Could you take a look?

[thomasdarimont]

Rebased on current main

[codecov]

Codecov Report

Merging #865 (5259ba3) into main (bef94e9) will increase coverage by 0.05%.
The diff coverage is 92.72%.

@@             Coverage Diff              @@
##               main     #865      +/-   ##
============================================
+ Coverage     95.45%   95.50%   +0.05%     
- Complexity     1304     1322      +18     
============================================
  Files            76       78       +2     
  Lines          4220     4272      +52     
  Branches        469      475       +6     
============================================
+ Hits           4028     4080      +52     
+ Misses           94       91       -3     
- Partials         98      101       +3     

Impacted Files	Coverage Δ
...ak/config/repository/ClientPoliciesRepository.java	89.47% <89.47%> (ø)
...ak/config/service/ClientPoliciesImportService.java	100.00% <100.00%> (ø)
...ys/keycloak/config/service/RealmImportService.java	100.00% <100.00%> (ø)
...cloak/config/util/resteasy/CookieClientFilter.java	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

No Coverage information
0.0% Duplication