Fixes #20261: Add a warning in plugin page if a version mismatches rudder patch one

[fanf]

https://issues.rudder.io/issues/20261

This change needs Normation/rudder-plugins#433 to work.

It brings back the old version format to Plugin version (in the code at least).

The main changes are:

• it needs main-build.conf in the classpath at the same place as build.conf to have access to rudder ABI version (ie the version of rudder used to build that plugin jar)
• simplify PluginVersion: in place of being some kind of poor copy of Version from utils, it's now just two Versions: one for the rudder ABI, the other for the plugin version
• normalize each version on at least 3 dot separated numbers, adding "0" for missing parts
• use the full plugin version (ie rudderABI-pluginOwnVersion) for the plugin object field version
• compare between plugin.version.rudderAbi and RudderConfig.rudderFullVersion (ie current rudder) to check if a warning message should be displayed (see below):

[Normation-Quality-Assistant]

OK, merging this PR