allow content filtering based on header "key" prop

[Croug]

Description

This PR adds a filterByKey flag for the Table component which allows columns to be re-arranged or even hidden based on the headers "key" property and order.

Fixes #191

Checklist:

Please delete options that are not relevant.

• [x] Is this a new feature
• [x] Have you submitted new feature or bugfix issue? Unless it's a small bugix, we generally prefer to track PRs against an issue which starts a dialogue to give us context.
• [x] Tests passing?
• [ ] Have you updated the docs? These live in site/docs

[Croug]

This PR is still a work in progress, I'll comment when it's ready to be merged

[roblevintennis]

Nice 👍🏽 reading from phone. Can you use the convert to draft mode for these so if doesn't get accidentally merged? When it's ready you can then convert back via the Ready for Review button at the bottom. Update: back on laptop was able to do this myself. Just hit Ready for Review when you're ready ;)

[Croug]

Ok cool, still new to the whole pull request process, didn't know that was an option!

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[Croug]

Added the storybook test, this is ready to be merged