LIMS-1514: Allow sorting of visit list

[ndg63276]

JIRA ticket: LIMS-1514

Summary:

The list of visits for a proposal is not sortable.
NB This PR replaces #854 which was found to break the main /current page in testing.

Changes:

• Combine the data collection count into the main db query so that it can be sorted on, if a proposal is specified
• Remove the need for an enter press on searching for a visit number, but add a debounce
• Make column headers actually be buttons so that the cursor becomes a pointer
• Re-fetch the data with a sort parameter if a header is clicked (apart from "Dewars")
• Re-fetch the data in the opposite direction if the same header is clicked again
• Don't add a search parameter if the search box is empty
• Allow searching by beamline name

To test:

• Open a proposal with a bunch of visits eg mx34263, and go to the /visits page
• Check you can sort by each header, in both directions, apart from "Dewars"
• Check the number of Data Collections is the same as on prod
• Search for a visit number, check only that visit number is displayed, check the debounce is working by looking at the requests sent
• Search for a beamline (eg i03), check only visits for that beamline are displayed
• Go to the 'Home' page (/current), check the page loads promptly