Optimize class path cache files

[EduardKrieger]

Adresses/Fixes #1476. Initial version to cache the dependencies more efficient and less error prone.

Implements

• generatePomFileHash reworked also takes m2 repo into account.
• first version of a validateCache function to check the cache.

@devonfw/cobigen

[EduardKrieger]

Closed because the branch is using the wrong base, switched to new PR #1613