Handle deleting table constraints

[seancolsen]

Fixes #328

Before

• No way to delete table constraints

After

User can delete table constraints through the "Table Constraints" modal.

(The slow frame rate of the gif doesn't really do justice to the CSS transitions, which I think look really nice in the browser.)

Notes

• After dropping the constraint, the constraints store is re-fetched.

• I added a couple new UI components:

  • Spinner, so that we can write <Spinner /> instead of <Icon data={faSpinner} spin={true}/>. (One fewer import!)

  • Seesaw (open to suggestions for a better name here) which switches between a "left" and "right" content using a slide transition.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the master branch of the repository
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[pavish]

@seancolsen I love the subtle animation and the simplicity of the confirmation view.

I do have a few comments which I'd like to be addressed before we merge this PR.

[pavish]

An additional minor comment: When all constraints are deleted, only an empty modal with a title is shown. It would be better if we showed additional text mentioning that there are no constraints available.

[seancolsen]

When all constraints are deleted, only an empty modal with a title is shown.

• Good call. In d384c4a changed the modal to display as follows:

  

[seancolsen]

@pavish Ready for re-review

[pavish]

@seancolsen The changes look good to me!

[kgodey]

Nice work on this @seancolsen.