Set up DiscoveryIndexer

[michalsidzej]

Resolves L2B-2154

This PR introduces new .env variables:

ETHERSCAN_API_KEY=

#-----OPTIONAL-----

CLOCK_INTERVAL_MS=

Using @l2beat/discovery required ethers degradation to 5.7.2.

Right now Discovery takes ~20 seconds locally, should be a bit faster on the server.

[linear]

L2B-2154 Set up DiscoveryIndexer

Context

The DiscoveryIndexer runs Discovery on LayerZero on Ethereum only, gets updates from the contracts and updates the data in our DB if there are any changes, no history is needed.

We'll use the discovery package from l2beat/tools

If it takes too long (more than 12 sec), it's fine if we run it on the latest block (not on every block).

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Name	Status	Preview	Updated (UTC)
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[sdlyy]

Also sanity check:

Please take a look at EthereumDiscoveryModule.ts:50. We've hard-coded the block we should start from there. We should either make it configurable or, I don't know 😅

[michalsidzej]

Also sanity check:

Please take a look at EthereumDiscoveryModule.ts:50. We've hard-coded the block we should start from there. We should either make it configurable or, I don't know 😅

e43542e