feat(reports): add reporters and basic first reports

Please check if the PR fulfills these requirements

[x] 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)

What kind of change does this PR introduce? Add reporters to the OpenReac API and first basic reports on the number of elements in the parameters.

What is the current behavior? No reporters at all.

What is the new behavior (if this is a feature change)? We add the possibility to use reporters to the API without breaking it and produce the first reports.

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

[ ] Yes
[x] No

powsybl / powsybl-optimizer

feat(reports): add reporters and basic first reports #55

Quality Gate passed