[BP: v6 <- #679] refactor: use cosmos sdk Int type for balances/token amounts

[mergify]

This is an automatic backport of pull request #679 done by Mergify.
Cherry-pick of 8e02aef has failed:

On branch mergify/bp/v6/pr-679
Your branch is up to date with 'origin/v6'.

You are currently cherry-picking commit 8e02aef.
  (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:   chain/cosmos/chain_node.go
	modified:   chain/cosmos/cosmos_chain.go
	modified:   chain/cosmos/poll.go
	modified:   chain/penumbra/penumbra_app_node.go
	modified:   chain/penumbra/penumbra_chain.go
	modified:   chain/polkadot/parachain_node.go
	modified:   chain/polkadot/polkadot_chain.go
	modified:   chain/polkadot/relay_chain_node.go
	modified:   chain/polkadot/tx.go
	modified:   ibc/chain.go
	modified:   interchain.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   chain/polkadot/query.go
	both modified:   conformance/flush.go
	both modified:   conformance/test.go
	both modified:   examples/cosmos/light_client_test.go
	deleted by us:   examples/hyperspace/hyperspace_test.go
	both modified:   examples/ibc/interchain_accounts_test.go
	both modified:   examples/ibc/learn_ibc_test.go
	both modified:   examples/ibc/packet_forward_test.go
	deleted by us:   examples/ibc/wasm/wasm_ibc_test.go
	deleted by us:   examples/ibc/wasm/wasm_icq_test.go
	both modified:   examples/polkadot/polkadot_chain_test.go
	deleted by us:   examples/polkadot/push_wasm_client_code_test.go
	both modified:   go.mod
	both modified:   ibc/types.go
	both modified:   interchain_test.go
	both modified:   internal/blockdb/messages_view_test.go
	both modified:   test_user.go

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

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