Backport TruLens to Python 3.8.1

[sfc-gh-chu]

Description

backports trulens to support python 3.8

Other details good to know for developers

Please include any other details of this change useful for TruLens developers.

Type of change

• [ ] 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 not work as expected)
• [ ] New Tests
• [ ] This change includes re-generated golden test results
• [ ] This change requires a documentation update

---

[!IMPORTANT] Backport TruLens to support Python 3.8.1 by updating version constraints and CI configurations.

• Python Version Compatibility:
  • Updated python version to ^3.8.1 in pyproject.toml files for trulens-core, trulens-feedback, trulens-dashboard.
  • Adjusted numpy and scipy version constraints for Python <3.9 in src/core/pyproject.toml and src/feedback/pyproject.toml.
• CI Configuration:
  • Added Python 3.8 to the Azure pipeline test matrix in ci-eval-pr.yaml.
  • Conditional execution of optional tests for Python 3.8 in run-optional-tests.yaml.
• Imports:
  • Replaced importlib.resources with importlib_resources in src/core/trulens/core/utils/imports.py for Python 3.8 compatibility.
• Misc:
  • Fix typo in tests/unit/static/test_deprecation.py.

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