Prop 506: Add LINK to the list of Major category assets

This proposal would add LINK to the list of assets that Osmosis recognises as strategically important for growth, increasing the incentives allocated to it.

## Details
LINK is currently the rank 21 cryptocurrency by marketcap with a valuation of around .4 Billion, 9 times higher than Osmosis.

The majority of trade volume happens on centralised exchanges or alternative DEXs, not on Osmosis.

This proposal asks if Osmosis has a strategic interest in attracting more liquidity of LINK and so will enable it to access a greater proportion of liquidity incentives.

This would be the first ERC20 token added to Major rather than native tokens.

## About Chainlink
Chainlink decentralized oracle networks provide tamper-proof inputs, outputs, and computations to support advanced smart contracts on any blockchain.

Website: https://chain.link/

Commonwealth Thread: https://commonwealth.im/osmosis/discussion/11356-signalling-proposal-for-adding-link-to-major