generalize services classes

[Mathieu-Deharbe]

Refactorization in order to simplify code sharing between computation microservices, especially in the 'service' package.

The code in the new 'computation' package should be copyable to all the other computation microservices and extended there.

It was created in a first PR in the load flow service, this PR is only an adaptation of the common classes to security analysis, but it will include some modifications.

Changes (that were in the loadflow version of the code, and therefore are now in the common code used bu security analysis) :

1. PostCompletion annotation in the NoificationService. This evolution was expected cf this TODO message in the security analysis notification service :
   // Today we don't send notification inside @transactional block. If this behavior change, we should use @PostCompletion to
   // make sure that the notification is sent only when all the work inside @transactional block is done.

=> it seems that now notification are indeed sent inside @transactional blocs so it should be fine (===> should be verified and tested) => checks with Anis Touri

2. there is now a logger for each message type (CANCEL_MESSAGE_LOGGER, STOP_MESSAGE_LOGGER...) => should be tested, does it imply something for the front ?
3. In the ReportService : the new common computation class adds a 'MediaType.APPLICATION_JSON'. Is it really new or was it implicitly done before ? => to check.

[Mathieu-Deharbe]

@SlimaneAmar @thangqp Your requests had a lot in common so I combined them into one commit.

I tested a few run and cancels and it all runs like before.

[thangqp]

Note : In common classes, there are several files which have some formats different to ones in loadflow but it is not important since we move only common files in loadflow server into a common repo

Code OK, Test OK (including 'stop a running')

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
83.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud