[SLS-8] Upgraded rep-build config to determine fixed java version

[alessio-cialini]

List of Changes

Introduced implementation through VIsma-Autopay http-signature of content digest validation and related tests. Introduced custom exception for digest validation
Updated core package structure

Motivation and Context

Required to expose a version of the digest validation within the http-signature draft

How Has This Been Tested?

Implenented and executed unit tests involving content digest validation

Screenshots (if appropriate):

Types of changes

• [] Chore (nothing changes by a user perspective)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.