feat(users/Profpatsch/openlab-tools): introduce handler abstraction r/6866

I’ve been wanting to experiment with this stuff for a while,
abstracting away a handler type.

The existentials for parser and body took a bit of mucking about, but
in the end hiding the variable behind a `Body` constructor did the
trick.

Now every handler has its own cache, which means we can start caching
arbitrary results.

Change-Id: If57230c47f97ef4c548683f2c2f27660817a31f2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9812
Autosubmit: Profpatsch <mail@profpatsch.de>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI

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