Prop 408: Signalling Proposal for OSMO/AVAX (#899) incentivised pool

This is a signalling proposal to include the AVAX pool OSMO/(w)AVAX (#899) into the set of assets that receive OSMO liquidity incentives.

After this proposal has passed governance, pool #899 will be added to the regular incentives program of Osmosis.

## About AVAX
AVAX is the native token of the Avalanche platform and is used to secure the network through staking, pay for fees, and provide a basic unit of account between the multiple subnetworks created on the Avalanche platform. wAVAX is the wrapped version of AVAX that enables use on the Avalanche network.
Website: https://www.avax.network/

Commonwealth Thread: https://commonwealth.im/osmosis/discussion/9547-onboarding-of-new-major-token-pool-avax