[fmcore] Migrated ScalableDataFrame and ScalableSeries, Reader and Writer out of fmcore and into "bears" repository.

[adivekar-utexas]

• [fmcore] Migrated ScalableDataFrame and ScalableSeries, Reader and Writer out of fmcore and into "bears" repository.
• [fmcore] Refactor fmcore to use external autoenum PyPI package.
• [fmcore] Migrated utils from fmcore to bears
• *[fmcore] Migrated FileMetadata and other data utils from fmcore to bears. Fixed minor issues. Removed "from typing import " usage.
• [fmcore] Pydantic v2 migration Replaced validator with model_ validator, Config class with model_config,
• [fmcore] Migrated data processing pipelines from fmcore to bears

Issue #, if available:

Description of changes:

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[adivekar-utexas]

Linked issue from bears: amazon-science/bears#1

[adivekar-utexas]

Tests have failed due to a missing fmcore.data.sdf import. Overriding this since it is fixed in a later commit locally.