feat: fall back to default cosmos sdk fee deductor (backport #99)

[mergify]

Based on: https://github.com/neutron-org/neutron/pull/551/files

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This is an automatic backport of pull request #99 done by Mergify.

[mergify]

Cherry-pick of 4b6c5fc has failed:

On branch mergify/bp/sdk-47/pr-99
Your branch is up to date with 'origin/sdk-47'.

You are currently cherry-picking commit 4b6c5fc.
  (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:   tests/app/ante.go
	modified:   tests/e2e/setup.go
	modified:   tests/e2e/suite.go
	modified:   x/feemarket/ante/fee.go
	modified:   x/feemarket/ante/fee_test.go
	modified:   x/feemarket/ante/suite/suite.go
	modified:   x/feemarket/post/fee.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   go.mod
	both modified:   go.sum
	deleted by us:   tests/e2e/consumer.go
	both modified:   tests/e2e/e2e_test.go
	both modified:   tests/e2e/go.mod
	both modified:   tests/e2e/go.sum

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