Fixes #22723: Backport scala 2.13 change for scala 3.0 migration

[fanf]

https://issues.rudder.io/issues/22723

Backport all changes compatible with scala 2.13. Commit 31d64d9 compensate for the drift since the PR was opened + for some changes that would require scala 3 or became unnecessary for now (moving PropertyParser in its own module for example).

The changes are mainly:

• a lot of added type ascription, added () and .apply
• removing all final in front of case object and object
• changing use of silencer by now builtin nowarn (and so com.github.ghik.silencer.silent by scala.annotation.nowarn)
• changing the scala 3 deprecated syntax for renaming self into a method call, e.g:

object RULES extends OU("Rules", BASE_DN) {
    rules =>
    private[this] def rules = this
...

• some xml magic concatenation syntax now illicit
• changing lift json implicit val formats = Serialization.formats(NoTypeHints) into implicit val formats = DefaultFormats
• avoiding having two different method having the same name (for ex: get / getIO in ConfigService)
• adding case in for loop when we extract a case class, typically case JString(ruleId) <- childs

Nothing seems to change code semantic anywhere (but welcomong a second pair of eyes).
If it's really the case, we should make the change in the oldest branch we support to avoid merge horror stories after that.

There is warning because of place where the replacement of silencer is not yet useful. I will remove them in second time

[fanf]

PR updated with a new commit

[fanf]

PR updated with a new commit

[Normation-Quality-Assistant]

This PR is not mergeable to upper versions.
Since it is "Ready for merge" you must merge it by yourself using the following command:
rudder-dev merge https://github.com/Normation/rudder/pull/4789
-- Your faithful QA
Kant merge: "All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason."
(https://ci.normation.com/jenkins/job/merge-accepted-pr/68352/console)

[Normation-Quality-Assistant]

This PR is not mergeable to upper versions.
Since it is "Ready for merge" you must merge it by yourself using the following command:
rudder-dev merge https://github.com/Normation/rudder/pull/4789
-- Your faithful QA
Kant merge: "It is beyond a doubt that all our knowledge begins with experience."
(https://ci.normation.com/jenkins/job/merge-accepted-pr/68444/console)

[fanf]

OK, squash merging this PR