Use the Reckoner to calculate a local development version with -SNAPSHOT

[klu2]

In #112 we decided to not apply the Reckon-Plugin locally (when not being on a CI-server) as of the discussion in ajoberstar/reckon#189 and instead hardcode the current version to 1.0.0-SNAPSHOT.

As this might be really confusing to developers, we should enhance this bypass as follows:

• If we are not on CI-servers, instantiate a Reckoner (but not the whole Gradle-Plugin)
• Configure it inferring the scope as patch, using stages rc and final (so just like the defaults inside our AutoConfigureSettingsPlugin
• Then run the Reckoner manually (again, only the core-class behind, not the plugin), you will get a version like 0.8.5-rc.0.0+20221111T075331Z which we don't want
• Then use convert this version manually to 0.8.5-SNAPSHOT and use this as the new project.version

That way:

• we still stick to semantic versioning as defined in Gradle (where 0.8.5-SNAPSHOT comes after 0.8.5-rc.0.0+20221111T075331Z)
• we are not getting exceptions from Reckoner which follows the SemVer spec on purpose
• we are not providing the tasks reckonTagCreate and reckonTagPush locally (which is good, as we're bypassing reckoner-default-logic)
• we still have a local development version that releates to our reckoned version on the CI server and is not just a dumb 1.0.0-SNAPSHOT