[Task] Add metadata/labels editor on archived recording upload form

[andrewazores]

https://github.com/cryostatio/cryostat/pull/1063

The backend is able to accept labels attributes on the POST form for uploading recordings. We should add the label editor component to the upload dialog so that users may choose to add labels to their uploads right away, instead of needing to do the upload and then add labels later, which may be a long time later if it is a large upload.

[andrewazores]

Since #505 is also merged, I wonder if it makes sense for users to be able to re-upload the recording.metadata.json file to provide the labels. The UI could get messy so it's just a thought. I imagine an upload button within the label editor that summons a JSON file dialog. After the user selects a metadata JSON file and submits it, the frontend parses the file and looks for the .metadata.labels map structure within. Whatever it finds is both added to the form submission for the recording upload, as well as rendered as label cells.