chunked multicalls, more logs, memory snapshots, nuke explorer apis

[meetmangukiya]

• Added a new option to set the max number of calls in 1 multicall
• Add logging with pino
• logMemory will log memory in debug level
• Nuking explorer(ethplorer, blockscout) token fetchers, directly fetch them from chain with RPC with Trade logs. The block explorer APIs return a lot of tokens(99% of which are airdropped shitcoins). We used to have a usd based filter earlier that filtered most of them out, but we removed that in 76d4d1c in Address review comments #11. ATM the ethplorer api returns like 7k tokens, it then goes on to request quote from the cow api for all of them which led to it using a lot of memory (6GB+) and taking too long(because of the rate limiter with exponential backoff logic). On the other hand, the chain strategy executed successfully in 6 minutes and has no dependency on external block explorer APIs and just requires querying the chain for Trade events.

[fleupold]

Code looks fine, although this could easily be three separate PRs (I'm also not sure if we actually want to check in the memory snapshots)