Improve spell checking on local development

[deadlydog]

Summary

Adds VS Code tasks and updated the devcontainer to be able to run CSpell spell check locally.
Also adds a local development section to the Contributing docs.

Checklist

Addresses issue #ISSUE_NUMBER (if applicable)

• Tests have been added for this code change (if applicable)
• Docs have been added or updated (if applicable)
• Code format follows the project style
• All new and existing tests passed

What type of changes does this PR include

• 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)

Describe the change in more detail

Previously you would need to wait for the CI/CD pipelines to tell you if there was a problem with a spellcheck word. Now you can find out quickly when you build the module.

[github-actions]

Overall Project	84.31%	🍏

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