[WIP] feature / lz gated follow, reference, collect modules

[imthatcarlos]

cross-chain, token gated follow + reference + collect modules

1. lensprotocol.lens has set their gated follow data. A new follower must have 50 AAVE on Optimism.
2. carlosbeltran.lens wishes to follow - fetches the requirements and generates the signature for #followWithSig
3. anyone (ex: a relayer) can submit the follow requirements + the signature to the LZGatedProxy contract on Optimism, which relays the payload to the LZGatedFollowModule contract on Polygon via LayerZero

• TLDR; the token balance check happens on Optimism, and the follow tx on Polygon

LZGatedFollowModule.sol

A Lens Follow Module that allows profile holders to gate their following with ERC20 or ERC721 balances held on other chains

• a profile initializes this module with a supported layerzero chain id and a erc20/erc721 contract + balance to check against
• another user wishes to follow, they read the requirements using gatedFollowPerProfile which points to the chain/token/balance
• user generates followWithSigData for a given profile
• user (or relayer) submits this sig along with appropriate input to the LZGatedProxy contract on the other chain
• LZGatedProxy makes the token check, and relays the message to the LZGatedFollowModule on polygon
• LZGatedFollowModule contract validates the input, submits sig to LensHub#followWithSig
• follow ✅

LZGatedReferenceModule.sol

A Lens Reference Module that allows publication creators to gate who can comment/mirror their post with ERC20 or ERC721 balances held on other chains.

• pretty much same flow as above

LZGatedCollectModule.sol

A Lens Collect Module that allows publication creators to gate who can collect their post with ERC20 or ERC721 balances held on other chains.

• pretty much same flow as above

LZGatedProxy.sol

This contract acts as a proxy for LZGatedFollowModule, LZGatedReferenceModule, and LZGatedCollectModule in order to read token balances from remote contracts on any chain supported by LayerZero.

• we deploy one of these on any EVM chain to be supported by the modules, wire up for trusted lz messaging
• when a user wishes to follow/comment/mirror/collect - they sign the correct data payload and submit along with the correct gate data
• the contract makes the token balance check against the erc20/erc721 contact defined
• if all good, relay the payload to our module contract on polygon

TODO

• fill in comments
• fill in tests
• LZGatedCollectModule
• testnet deployment
• estimate gas
• end to end test

[imthatcarlos]

Closing in favor of the PR in the lens modules repo: lens-protocol/modules#26