Multiselect table filter

[JoelArmendariz]

Summary

Closes #1432

Relevant ticket item: https://github.ibm.com/wiotp/monitoring-dashboard/issues/728

Adds the ability to filter a table based on a multiselect dropdown.

Change List (commits, features, bugs, etc)

Add isMultiselect option on the filter prop for Table
Render Multiselect for filtering in the FilterHeaderRow
Update TableReducer logic to handle multiselect filters.

Acceptance Test (how to verify the PR)

Go to the Table example with multiselect filtering story in storybook and confirm that the multiselect properly filters the table.

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[tay1orjones]

I've added a link to close the relevant issue on this repo

[tay1orjones]

Looks good! Functionally, the search results update, pagination reflects the changes, keyboard navigation looks solid - you can focus to deselect all options at once or individually inside the menu. Code is 👍

I think it would be beneficial to add some RTL tests that cover the general interaction though. Something like:

• render table with preselected filters
  • deselect one filter, add one filter, remove all filters - assert between each that the search results are updated in the dom and the pagination component displays the proper result count
• render table without preselected filters
  • do similar flow as above, maybe modify to deselect all filters first then add new ones or something

I know this will overlap some of the tests that Carbon has on Multiselect, but as they make changes (and we update to accept them) it would be great to ensure the table functions aren't impacted. They recently upgraded downshift for instance (#1462 WIP) and I've found some problems were caught by tests, while others were not. We've also seen changes where reducer tests pass but functionally things have broken. Trying to avoid these things as much as possible, particularly with the Table

[JoelArmendariz]

Thanks @tay1orjones . That does sound very beneficial to hopefully catch some bugs with this as versions change. I will add some RTL test cases.

[JoelArmendariz]

@tay1orjones I have added some RTL test cases to cover preselected filters, non-preselected filters, adding filters, removing filters, and clearing the multiselect box.

[sstone2423]

Great job!

[tay1orjones]

Thanks for adding those tests! 🎉