feat: make PoolModuleI CalculateSpotPrice API return BigDec (backport #6487)

[mergify]

This is an automatic backport of pull request #6487 done by Mergify.
Cherry-pick of a171707 has failed:

On branch mergify/bp/v19.x/pr-6487
Your branch is up to date with 'origin/v19.x'.

You are currently cherry-picking commit a1717070.
  (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:   app/apptesting/gamm.go
	modified:   app/apptesting/test_suite.go
	modified:   tests/mocks/pool_module.go
	modified:   x/concentrated-liquidity/pool.go
	modified:   x/concentrated-liquidity/pool_test.go
	modified:   x/cosmwasmpool/pool_module.go
	modified:   x/gamm/keeper/grpc_query.go
	modified:   x/gamm/keeper/grpc_query_test.go
	modified:   x/gamm/keeper/pool_service.go
	modified:   x/gamm/keeper/pool_service_test.go
	modified:   x/gamm/keeper/swap_test.go
	modified:   x/gamm/pool-models/balancer/pool_suite_test.go
	modified:   x/gamm/types/constants.go
	modified:   x/poolmanager/client/query_proto_wrap.go
	modified:   x/poolmanager/router_test.go
	modified:   x/poolmanager/types/expected_keepers.go
	modified:   x/twap/api_test.go
	modified:   x/twap/listeners_test.go
	modified:   x/twap/logic.go
	modified:   x/twap/types/expected_interfaces.go
	modified:   x/twap/types/twapmock/amminterface.go
	modified:   x/twap/types/utils.go
	modified:   x/txfees/keeper/feetokens.go
	modified:   x/txfees/keeper/grpc_query.go
	modified:   x/txfees/types/expected_keepers.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   app/upgrades/v16/upgrades_test.go
	both modified:   app/upgrades/v17/upgrades_test.go
	both modified:   x/poolmanager/router.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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[p0mvn]

Confirmed state compat on the node