fn: more fn goodies

[ProofOfKeags]

Change Description

We add fn equivalents of the following Haskell functions:

• sequenceA renamed to Collect, both the Option and Result variants
• traverse, both Option and Result variants
• mapMaybe, renamed to FilterMap
• catMaybes, renamed to TrimNones
• note
• hush

These are additions to the API that I discovered were missing when trying to do a refactor.

Steps to Test

I can add tests if need be but for the most part I think the functions themselves are mostly checked by the type system. Thoughts appreciated.

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[carlaKC]

Nice additions, no major comments!

[carlaKC]

lgtm, just nits

[ProofOfKeags]

This PR has transformed into the breaking change PR we have been planning for some time. Micro label has been stripped. Merging this means we must push a tag for fn v2.0.0

[starius]

LGTM

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@Roasbeef: review reminder
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