Save network area diagram metadata in JSON format

[massimo-ferraro]

Please check if the PR fulfills these requirements

• [X] The commit message follows our guidelines
• [X] 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? Network area diagram metadata is serialized in XML format inside the SVG

What is the new behavior (if this is a feature change)? Network area diagram metadata is serialized in JSON format

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

• [X] Yes
• [ ] No

If yes, please check if the following requirements are fulfilled

• [x] The Breaking Change or Deprecated label has been added
• [X] The migration steps are described in the following section

What changes might users need to make in their application due to this PR? (migration steps) The draw methods in the com.powsybl.nad.NetworkAreaDiagram class that take as input a writer parameter, for the SVG, now take as input also a second writer parameter, for the JSON metadata. Examples can be found in com.powsybl.nad.NetworkAreaDiagramTest test class.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
92.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud