Connected chains: Sui

[fadeev]

Add a page dedicated to Sui in the Build -> Connected chains section of the docs. Similar to the EVM page.

The page should cover the Gateway contract, concepts like Gateway module ID, object ID, capabilities (high level overview), the functionality available on Sui through the Gateway (deposit/deposit and call).

Mention that this functionality currently is only available on localnet.

Sui contracts: https://github.com/zeta-chain/protocol-contracts-sui

Latest Sui-enabled version of localnet: zeta-chain/localnet#76

[CharlieMc0]

SUI Support all needs to be added to the functionality tracker - https://www.zetachain.com/docs/developers/chains/functionality/