feat: Collections

[GreatGodApollo]

Is your feature request related to a problem? Please describe.
An issue with several other pastebins is that you aren't able to easily group together a bunch of similar pastes. Without an easy way to provide a single URL, you end up spamming the other person with a bunch of links, without an obvious link between them all.

Describe the solution you'd like
A potential solution would be to allow a user to create a collection of pastes using a UI, which would provide a URL in a fashion similar to /col/{pastes}. The {pastes} could either be a URL encoded list of paste IDs, a Base64 encoded list of paste IDs, or a collection ID that would need to be stored in the DB.

Describe alternatives you've considered
The only other alternative is to just send a bunch of links to another user, without any way to specifically state that these pastes are directly related.

Additional context
N/A

[jackdorland]

This'll come once we complete associated uploads, but good suggestion! I'd say storing each link in the DB along a collection table.

[lukewhrit]

This'll come once we complete associated uploads, but good suggestion! I'd say storing each link in the DB along a collection table.

That's what I suggest as well. The structure of the database would be very simple:

Collection Identifier	Documents
xMeR0XMoQZA4	[ UMhbRYQlI4NB, FaeDV6jJN9eR ]

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