[v0.1.4] Migrations: (i) various modules to bears (ii) Pydantic 1.10.15 to >=2.10.5 (ii) external autoenum package.

Details of changes

• Moved utils to bears PyPI package
• Moved data processing to bears PyPI package
• Moved (most) constants to bears PyPI package
• Refactored to use external autoenum PyPI package
• Pydantic v2 migration: Replaced validator with model_ validator
• Pydantic v2 migration: Replaced root_validator with model_ validator
• Pydantic v2 migration: Replaced Config class with model_config
• Removed "from typing import *" usage.
• Various minor fixes.
• Moved code to "private" modules.
• Removed requirements.txt as it is no longer used for dependency management.

What's Changed

• [Copilot][Claude 3.5 Sonnet] Added detailed technical comments for concurrency utils by @adivekar-utexas in #11
• Ran Ruff Linting on entire codebase to optimize imports. by @adivekar-utexas in #12
• Fix to Test PyPi token secret key in GitHub upload workflow release.yml by @adivekar-utexas in #13
• [fmcore] Migrated ScalableDataFrame and ScalableSeries, Reader and Writer out of fmcore and into "bears" repository. by @adivekar-utexas in #15
• [fmcore] Migrations: (i) modules to bears (ii) Pydantic 1.10.15 to >=2.10.5 (iii) external autoenum package. by @adivekar-utexas in #16

Full Changelog: v0.1.3...v0.1.4