RFC: collectd: enable a bunch of plugins (by adding more deps)

Increases the closure size from 129 MiB to 546 MiB.

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Actually, I'm unsure of whether this should be committed or not, so I'm making this PR as a RFC. There are so many plugins (more than I've now enabled) that I'm wondering if the better/more sustainable solution is to tell users to just use lib.overrideDerivation in configuration.nix... Thoughts?