Add recording tag model

[naglepuff]

Fix #259

Adds the ability to add a tag to recordings on upload or update. Displays the tag in the recordings table, and allows for filtering by one or more tags.

Here is what model management looks like for tags:

Each recording tag has a text value and belongs to a specific user. When that user is logged in, they can choose from pre-existing tags that they've created, or type in a new tag:

Each table also has a drop-down on top to enable filtering by tag. The tag column is sortable.

Todo:

• Select tag for bulk upload

[BryonLewis]

This completely works functionally given the requirements of issue. The only 'real' requested change is some minor typing stuff in the client.
I have some questions about the functionality that may require some group discussion. Mostly these are questions that if they change the requirements I think would be better addressed in this PR instead of trying to do migration in the future (mostly the idea of multiple tags being associated with a recoring and if we want to support that). I just bring up the multiple tags because my experience indicates that someone is going to ask for it down the line.

[naglepuff]

Change Tag -> Tags in the UI

[BryonLewis]

Thanks for adding the multi tag stuff
Just a few minor things:

The patch request on Recording and modification so it accepts multiple new tags and allows for removal of tags

See if the number of migration files can be reduced by recreating the migrations

The idea of uniqueness and tags being tied to a user can be visited in the future. Don't do anything but just think about it a bit.

[BryonLewis]

👍