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.

[fanf]

PR updated with a new commit

[fanf]

PR updated with a new commit

[fanf]

Superseeded by #4789