As a user I want to collect fee earnings in THX

[peterpolman]

TODO

• Set the factory address with contractor
• Get the quickswap factory
• Create method deposit()
• In method call factory.getPair(maticAddr, ethAddr) for MATIC/ETH
• See if the pair exists
• If not create the pair factory.createPair(maticAddr, ethAddr)

Flow

• Deposit ERC20 in pool
• Transfer fee to erc20-swapper contract (collector)
• Call swapper.collect()
• Call swapper.swap()

1. Get pair for ERC20/ETH from quickswap factory

• Swap ERC20 for ETH
• Swap ETH for THX
• Transfer THX to balancer pool

3. Create pair for ERC20/THX from quickswap factory if ERC20/ETH pair is not found

• Provide liquidity (THX) for new pair
• Swap ERC20 for THX
• Transfer THX to balancer pool