Add partition offset methods for multiple OffsetSpecs

[masesdevelopers]

Description

Introduce multiple partition-offset helpers: ForTimestampPartitionOffsetForTopic (DateTime and unix-ms), MaxTimestamp, Earliest, EarliestLocal, EarliestPendingUpload, Latest and LatestTiered. Refactor PartitionOffsetForTopic to accept an OffsetSpec and a delta adjustment (used to normalize latest offsets), and update offset computation accordingly. Also add System using. This replaces the prior LastPartitionOffsetForTopic with more explicit OffsetSpec-based methods and centralizes disposal/OffsetSpec handling.

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Motivation and Context

How Has This Been Tested?

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Types of changes

• 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 change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.