Prop 574: Recognising USDT Canonical status for Osmosis

This proposal signals that Osmosis adopts USDT via Kava as the canonical version of USDT on Osmosis.

# Details
## Canonical USDT
This proposal signals that USDT via Kava will be the canonical version of USDT in use with the following criteria defined in the previous Canonical Asset Proposal 205. The more IBC version of USDT available leads to increased security, shorter routes to source, and lower bridging fees than continuing to use the current version of USDT via Axelar.

Canonical status sets the following agreement:

Default Asset List – assets will be unprefixed in the app.osmosis.zone default asset list, e.g. USDT with all other bridges’ assets being bridge1USDT, bridge2USDT, etc. Osmosis DAO requests that allied/friendly front-ends do the same, though any front-end is free to make its own decisions.

Osmosis Incentives – the DAO commits to prioritizing the Canonical Bridge assets, incentivizing them earlier and more heavily than the comparable assets of non-canonical bridges. In general, canonical pools should earn substantially more incentives per dollar of liquidity than their counterpart pools–under the base incentives model, not necessarily counting external incentive matching.

This proposal does not currently impact incentives on Pool 831, henceforth known as axlUSDT/OSMO, but indicates that a migration of incentives is likely to happen in a subsequent proposal once Supercharged pools are established.
\Forum Thread: https://forum.osmosis.zone/t/recognising-usdt-canonical-token-status-for-osmosis/39