feat: add func to shorten strings, deprecate old hash funcs

[ValentinGerlach]

What this PR does / why we need it:

• Adds a function ShortenToXCharacters that can be used to shorten strings
  • Example: my-namespace.my-managed-control-plane-name, 32 => my-namespace.my-manage--px6ejzpe
• Deprecates old hash functions
  • K8sNameUUID
  • K8sNameUUIDUnsafe
  • K8sObjectUUID
  • K8sObjectUUIDUnsafe
  • K8sNameHash
• Change visibility of version8UUID so that we don't accidentally use it outside of K8sNameUUID

Release note:

feat: add func to shorten strings
chore: deprecate old hash funcs

[n3rdc4ptn]

lgtm, really nice :)