fix: Remove genesis supply offsets

[nicolaslara]

Needed for osmosis-labs/osmosis#2307

What is the purpose of the change

The sdk fork is using GenesisSupplyOffsets in the banktypes.NewGenesisState() constructor. This is incompatible with the ibc-go testing package which expects the new signature (https://github.com/cosmos/ibc-go/tree/main/testing).

Brief Changelog

• Updated the constructor to match the expected interface.
• Added a new constructor that can be used for the previous behaviour

Testing and Verifying

Tests pass

Documentation and Release Note

• Does this pull request introduce a new feature or user-facing behavior changes? (no)
• Is a relevant changelog entry added to the Unreleased section in CHANGELOG.md? (no)
• How is the feature or change documented? (not applicable)

[ValarDragon]

We should change NewGenesisState as done here, and make a new method for NewGenesisStateWithSupplyOffsets I think for now.

[nicolaslara]

Updated according to @ValarDragon's comments. Less changes this way (even if we keep the legacy GenesisSuplyOffsets around)

[nicolaslara]

@alexanderbez I tried merging main into this branch, but had issues with the integrations on the osmosis side. Are the changes from a296bdc already reflected on osmosis/main?

[nicolaslara]

Closing in favor of #312