Add network events to IIDM API

[geofjamg]

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?

Network notifications unit testing is hard and not done the same way everywhere.

What is the new behavior (if this is a feature change)?
We added in the API a network event data model and an network listener responsible for event recording that will be used at the end in every notification unit tests and also maybe for other use cases.

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)

NetworkListener has been modified with breaking changes:

• onUpdate overload without variant ID has been removed, we expect now to one with variant ID to use everywhere and with a null variantId in case of attribute that do not depend on variant.
• onElementAdded has been renamed onPropertyAdded and default empty implementation has been removed
• onElementReplaced has been renamed onPropertyReplaced and default empty implementation has been removed
• onElementRemoved has been renamed onPropertyRemoved and default empty implementation has been removed
• default empty implementation of onVariantCreated, onVariantOverwritten, onVariantRemoved have been removed

Substation geographicalTags attribute is no more an (old) element type notification but a standard attrbute notification

Other information:

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
85.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud