v2.0.0-pre1

New features:

• Don't fetch beacon balances for non-reportable epochs
• Add Prometheus metrics
• Integrate stETH price oracle
• Allow specifying max_multicall via env variable

Breaking changes:

• Rename ETH1_NODE env variable to WEB3_PROVIDER_URI

Internals:

• Use Lido helpers lib
• Improve error logging and handling

Dependencies:

• Bump urllib3 from 1.26.2 to 1.26.3