Add zoom to fit functionality and button to NAD viewer

[massimo-ferraro]

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

Does this PR introduce a new Powsybl Action implying to be implemented in simulators or pypowsybl?

• Yes, the corresponding issue is here
• No

What is the current behavior?
In network area diagram viewer there is no functionality to automatically resize the SVG in order to fit it in the window

What is the new behavior (if this is a feature change)?
In network area diagram viewer there is a functionality and a button to automatically resize the SVG in order to fit it in the window

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

• Yes
• No

If yes, please check if the following requirements are fulfilled

• The Breaking Change or Deprecated label has been added
• 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 constructor of the NetworkAreaDiagramViewer has an additional parameter: the flag for enabling the visualization of the button.
The demo/src/diagram-viewers/add-diagrams.js file has been changed for including this new parameter

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
46.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud