[BP: release/v6 <- #202] refactor: remove the ability to take a fee for each forwarded packet

[mergify]

Previously the PFM had a parameter that was used to take a percentage of each transfer that was forward through it, which would then be sent to the community pool. After many years of being used on many chains we found that absolutely no one was utilizing this feature and that it likely didn't make sense in the context of how PFM was actually used out in the wild. Rather than trying to maintain this feature we decided that we would just remove this functionality from the PFM all together.

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This is an automatic backport of pull request #202 done by Mergify.

[mergify]

Cherry-pick of 26d8080 has failed:

On branch mergify/bp/release/v6/pr-202
Your branch is up to date with 'origin/release/v6'.

You are currently cherry-picking commit 26d8080.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   middleware/packet-forward-middleware/Makefile
	modified:   middleware/packet-forward-middleware/e2e/forward_timeout_test.go
	modified:   middleware/packet-forward-middleware/packetforward/types/genesis.go
	modified:   middleware/packet-forward-middleware/packetforward/types/keys.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   middleware/packet-forward-middleware/e2e/upgrade_test.go
	both modified:   middleware/packet-forward-middleware/go.mod
	deleted by them: middleware/packet-forward-middleware/packetforward/client/cli/cli.go
	both modified:   middleware/packet-forward-middleware/packetforward/keeper/genesis.go
	deleted by them: middleware/packet-forward-middleware/packetforward/keeper/grpc_query.go
	both modified:   middleware/packet-forward-middleware/packetforward/keeper/keeper.go
	deleted by them: middleware/packet-forward-middleware/packetforward/keeper/params.go
	both modified:   middleware/packet-forward-middleware/packetforward/module.go
	both modified:   middleware/packet-forward-middleware/packetforward/module_test.go
	deleted by us:   middleware/packet-forward-middleware/packetforward/types/codec.go
	both modified:   middleware/packet-forward-middleware/packetforward/types/expected_keepers.go
	both modified:   middleware/packet-forward-middleware/packetforward/types/genesis.pb.go
	deleted by them: middleware/packet-forward-middleware/packetforward/types/params.go
	deleted by them: middleware/packet-forward-middleware/packetforward/types/query.pb.go
	deleted by them: middleware/packet-forward-middleware/packetforward/types/query.pb.gw.go
	both modified:   middleware/packet-forward-middleware/proto/packetforward/v1/genesis.proto
	deleted by them: middleware/packet-forward-middleware/proto/packetforward/v1/query.proto
	both modified:   middleware/packet-forward-middleware/test/mock/bank_keeper.go
	both modified:   middleware/packet-forward-middleware/test/mock/channel_keeper.go
	deleted by them: middleware/packet-forward-middleware/test/mock/distribution_keeper.go
	both modified:   middleware/packet-forward-middleware/test/mock/ibc_module.go
	both modified:   middleware/packet-forward-middleware/test/mock/ics4_wrapper.go
	both modified:   middleware/packet-forward-middleware/test/mock/transfer_keeper.go
	both modified:   middleware/packet-forward-middleware/test/setup.go
	deleted by us:   middleware/packet-forward-middleware/testing/simapp/app.go
	deleted by us:   middleware/packet-forward-middleware/testing/simapp/upgrades/upgrades.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[Reecepbcups]

I do not think this file is run at all here (due to not adding the gh ci), it can probably be removed safely for anything which is not main branch

[jtieri]

good call out, there may be a bit of dead code at this point. may need to just do an audit of that while we rectify any issues discovered in the audit.