Uniswap: L2 to L1 to L2

[rahul-kothari]

Description

Y'all personal aztec connect is here!!
Close #875 (builds on #843)

Goal -> Deposit WETH into L2 and then swap to DAI using L1 Uniswap i.e.

1. Deploy WETH, DAI and Uniswap Portal contracts respectively (on L1 and L2)
2. Deposit WETH to L2 (using familiar L1 to L2 messaging)
3. Create an L2 to L1 message to withdraw WETH to the UniswapPortal. Also create an L2 to L1 message to signal that I want to swap WETH to DAI to my address (latter is necessary to ensure no one can change params and execute the swap)
4. User now calls the Uniswap portal which consumes the two messages, executes the swap and then sends a L1->L2 message to mint DAI on L2 back to the user!
5. Mint the DAI on L2 to the right user!

Some things were updated to make it all work:

• Update MAX_ARGS in a noir function to 16!
• Archiver sets lastProcessedBlockNumber to config.searchStartBlock - this ensures that we skip processing blocks based on what the config wants! Useful when forking mainnet (like we have to) and only process blocks from current block.
• The above test can only run in a fork of mainnet. (Same is true for the solidity tests) so that we can use uniswap. For this to run in CI, appropriate modifications have been made
• Create a noir contract (for uniswap portal) that takes in the input asset (DAI), sends message to withdraw it to L1 (so L1 uniswap can execute a trade) and builds the L2 to L1 swap() message.
• create uniswap portal solidity contract which can consume DAI from its portal, consume a swap() message request from L2, execute the swap and then push the swapped asset (here WETH) to its portal so it can be minted on L
• A loooong script in E2E that does the flow explained above

Checklist:

• I have reviewed my diff in github, line by line.
• Every change is related to the PR description.
• I have linked this pull request to the issue(s) that it resolves.
• There are no unexpected formatting changes, superfluous debug logs, or commented-out code.
• The branch has been merged or rebased against the head of its merge target.
• I'm happy for the PR to be merged at the reviewer's next convenience.

[LHerskind]

Added some nits, otherwise good. If you create the extra issue for cancellations on uniswap portal