Add sonar cloud analysis in CI for java code

[rolnico]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem?
No

What kind of change does this PR introduce?
Feature

What is the current behavior?
Sonar cloud analysis was only done for the python code

What is the new behavior (if this is a feature change)?
The analysis is now also done for the java code

Does this PR introduce a breaking change or deprecate an API?

• Yes
• No

Other information:

[sonarcloud]

Quality Gate failed for 'pypowsybl (java)'

Failed conditions
1 Security Hotspot
32.2% Coverage on New Code (required ≥ 80%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[sonarcloud]

Quality Gate passed for 'pypowsybl'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud