CUMULUS-4436: Adding initial best practices information for languages and adding tasks

[bhazuka]

Summary: Summary of changes

Addresses CUMULUS-4436: Update Cumulus documentation on Python and tasks

Changes

• Created new file docs/development/python-best-practices.md to capture Python language expectations, tooling, and standards.
• Created new file docs/development/typescript-best-practices.md to capture Typescript language expectations, tooling and standards. Content from this was pulled from various cumulus docs.
• Modified docs/development/quality-and-coverage.md file to reference the "best practice language docs" and provide a higher level repo management explanation of tooling and usage.
• Modified docs/adding-a-task.md to provide overview and expectations for creating a task.
• Modified website/sidebar.js to include new "best practices" documents.

PR Checklist

• Update CHANGELOG
• Unit tests (N/A)
• Ad-hoc testing - Deploy changes and test manually (Tested via Docusarus local build and visual verification)
• Integration tests (N/A)

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