Add new functions to the fn package

[Chinwendu20]

Change Description

This adds new functions to the fn packages. Changes include:

• A new file for map functions accompanied with a test file.
• Added new functions for slice accompanied with test.

This is required for this PR: https://github.com/lightningnetwork/lnd/pull/8516/

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[Chinwendu20]

Does this need a release note? could not find anything about fn in the other release notes.

[Roasbeef]

Are you aware of this package: https://pkg.go.dev/golang.org/x/exp/maps? Most of what you've added is already here.

[Chinwendu20]

Are you aware of this package: https://pkg.go.dev/golang.org/x/exp/maps? Most of what you've added is already here.

Not really, I just checked it and it seems that is that is the case. Thanks for pointing it out would be closing this now.

[Chinwendu20]

Thanks for the feedback @ProofOfKeags. I would rework and open another PR. Oops just looked down while typing this and realised that I can reopen this PR.

[Chinwendu20]

Thanks.

Do I have to wait for a new release of this package to use it?

Looked at the comments on my tlv PR and it seems like I would just wait. I think maintainers are the ones to make releases.

[guggero]

I pushed a new tag called fn/v1.0.6. So in the PR that depends on it, you can update the github.com/lightningnetwork/lnd/fn dependency to v1.0.6 in go.mod.