Implement com.powsybl.tools.Version

[geofjamg]

• Do you want to request a feature or report a bug?
  feature

• What is the expected behavior?
  Like in other repos, com.powsybl.tools.Version has to be implemented to be able to show repository list at runtime.
  This is what we use on pypowsybl side to display the table:

Powsybl versions:
+-----------------------------+-----------------------+------------+------------------------------------------+-------------------------------+
| Repository name             | Maven project version | Git branch | Git version                              | Build timestamp               |
+-----------------------------+-----------------------+------------+------------------------------------------+-------------------------------+
| powsybl-open-loadflow       | 0.14.0                | UNKNOWN    | eb45d6b44c716cb97c3f634489579dbc4fe29172 | 2021-11-17T16:52:25.446+01:00 |
| powsybl-single-line-diagram | 2.5.1                 | UNKNOWN    | 8f5ae2e12c1b6a761a72d4c97c429e36e5ec0aa2 | 2021-11-19T11:32:28.775+01:00 |
| powsybl-core                | 4.5.1                 | UNKNOWN    | 0ccf8f5741464e426f1a17ed51de5822cfbc3e71 | 2021-11-18T14:57:11.457+01:00 |
+-----------------------------+-----------------------+------------+------------------------------------------+-------------------------------+

• What is the motivation / use case for changing the behavior?

• Please tell us about your environment:

  • PowSyBl Version: ...
  • OS Version: ...

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, spectrum, etc)

(if a question doesn't apply, you can delete it)