Decouple Azure Devops from git-plugin and prepare for other Git providers

[MartinKanters]

This PR decouples the git-plugin from Azure Devops and attempts to create a generic layer in order for being able to implement other Git providers like GitHub.

Summary:

• All Azure related code is moved to package provider.azure.
• A GitProvider interface is created (with AzureDevopsGitProvider being the one implementation at this moment). The methods are almost a copy of the AzureDevopsClient methods, with some small changes made to decouple it a bit from AzDo's API specifics
• A rough copy of all domain classes of Azure have been made as a generic domain model
• All commands talk to the GitProvider instead of the AzureDevopsClient
• The PluginConfig class has been made Azure Devops specific and moved to its package

I've tested it successfully using both mvn quarkus:dev and injecting it as a plugin to ret. Only a snapshot build of the latest commit of ret worked, with the released 0.1.3 I get the following error (edit: this is not fixed with 0.1.4, but is probably due to me using an arm machine for building the plugin while RET is amd, when building ret myself, it works.):

Exception in thread "main" java.lang.UnsatisfiedLinkError: Can't load library: /Users/martin/.ret/plugins/git-plugin.dylib
plugin  at org.graalvm.nativeimage.builder/com.oracle.svm.core.jdk.NativeLibrarySupport.loadLibraryAbsolute(NativeLibrarySupport.java:92)
        at [email protected]/java.lang.ClassLoader.loadLibrary(ClassLoader.java:57)
        at [email protected]/java.lang.Runtime.load0(Runtime.java:785)
        at [email protected]/java.lang.System.load(System.java:2011)
        at io.rabobank.ret.command.PluginInitializeCommand.run(PluginInitializeCommand.kt:20)
        at picocli.CommandLine.executeUserObject(CommandLine.java:2026)
        at picocli.CommandLine.access$1500(CommandLine.java:148)
        at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2461)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2453)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2415)
        at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2273)
        at picocli.CommandLine$RunLast.execute(CommandLine.java:2417)
        at io.rabobank.ret.config.CommandLineConfiguration.customCommandLine$lambda$0(CommandLineConfiguration.kt:18)
        at io.quarkus.picocli.runtime.PicocliRunner$EventExecutionStrategy.execute(PicocliRunner.java:26)
        at picocli.CommandLine.execute(CommandLine.java:2170)
        at io.quarkus.picocli.runtime.PicocliRunner.run(PicocliRunner.java:40)
        at io.quarkus.runtime.ApplicationLifecycleManager.run(ApplicationLifecycleManager.java:132)
        at io.quarkus.runtime.Quarkus.run(Quarkus.java:71)
        at io.quarkus.runtime.Quarkus.run(Quarkus.java:44)
        at io.quarkus.runner.GeneratedMain.main(Unknown Source)

Also, I had to replace all booleans with java.lang.Boolean in the .plugin file after initializing it. (edit: this one is fixed when using 0.1.4)

I'll try to work on a GitHub implementation next (in a separate PR).

What do you think?

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