CCIP-096 - Create a free secondary level for sub supporters available only to top 15 exchanges according to CMC that list and maintain a Moon listing

This proposal aims to offer a free sub supporter level available only to top 15 exchanges according to CMC that list and maintain a fully functional Moon listing (deposits/withdrawals/trading/etc..).

https://coinmarketcap.com/rankings/exchanges/

This free tier would not receive free banner days or free events unless they are listing Moons for the first time on (Arb One or Arb Nova) in which they could get a free AMA [an entity that is listed on Nova could get a free ama for listing on One]. They would however get all other perks unless stated otherwise in another governance proposal.

Increased Visibility will work differently. Importantly the free sub supporter level visibility would always be below paid supporters. Meaning if someone burned Moons to become a sub supporter they would always be above any exchanges that got the status for free. Of course exchange could upgrade their status by burning Moons and locking in the increased visibility. Increased visibility for Exchange free status will be based on their ranking according to the CMC rankings above.