style: Isortifying the repo and adding pyproject.toml

[vrdmr]

Description

Adding Isort for the repo and adding configuration.

• Removed the isort.cfg in favor of PyProject.toml file
• Isorted the complete azure_functions_worker and test module. Made minor changes in the sort order and skipped protos.

Fixes #

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PR information

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• New Unit tests were added for the changes made and CI is passing.

Quality of Code and Contribution Guidelines

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[vrdmr]

No need for isort specific config, using pyproject.toml to set these settings.

[vrdmr]

Skipping these two for preventing cyclic import issue when importing from .context import Context