Expanded tags and packets to accept any Python data type and use Arrow-based datastore

[eywalker]

• Major refactor of pod logic to accept tags and packets with arbitrary Python data type
• New set of data stores (ArrowDataStore) that accepts arrow tables to be stored, being aware of "semantic_type" metadata to handle special fields such as Path and UUID using registered handlers
• New hasher for Arrow table that is "semantic_type" aware
• New logic of "saving" computation results and associated tags into result_store and tag_store using CachedFunctionPod

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Pull Request Overview

This PR refactors multiple components to enable support for arbitrary Python data types and integrates a new Arrow‐based datastore. Key changes include renaming of parameters (e.g. replacing “store_name” with “function_name” and “content_hash” with “function_hash”), updating hasher factory methods to use the new API, and modifying various import paths and error messages to reflect the architectural changes.

Reviewed Changes

Copilot reviewed 71 out of 83 changed files in this pull request and generated no comments.

File	Description
tests/*	Updates to test cases with revised parameter names and updated import paths
src/orcabridge/store/*	Refactor of DirDataStore and SafeDirDataStore to use new function-based naming conventions
src/orcabridge/hashing/*	Adjustments to hasher implementations and defaults to align with new API, including renaming in factory methods
notebooks/*	Notebook examples updated with new import paths and parameter names

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Codecov Report

Attention: Patch coverage is 25.49356% with 1736 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/orcabridge/store/arrow_data_stores.py	0.00%	723 Missing ⚠️
src/orcabridge/pod/core.py	18.61%	258 Missing ⚠️
src/orcabridge/core/operators.py	20.47%	167 Missing ⚠️
src/orcabridge/types/registry.py	23.03%	137 Missing ⚠️
src/orcabridge/core/base.py	40.09%	121 Missing ⚠️
src/orcabridge/hashing/semantic_arrow_hasher.py	21.92%	89 Missing ⚠️
src/orcabridge/types/handlers.py	58.57%	29 Missing ⚠️
src/orcabridge/hashing/function_info_extractors.py	31.70%	28 Missing ⚠️
src/orcabridge/utils/stream_utils.py	27.02%	27 Missing ⚠️
src/orcabridge/types/inference.py	72.22%	20 Missing ⚠️
... and 19 more

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