eth_feeHistory should take a hexstring for block_count instead of an int

[kclowes]

System information

Erigon version: 2021.08.2-alpha

OS & Version: All

Expected behaviour

There's been some movement to standardize the parameters for the block_count argument for the eth_feeHistory RPC method. The spec says that clients should accept a hexstring representation of the block count, but currently Erigon only accepts integers.

See issues: ethereum/execution-apis#20, and ethereum/go-ethereum#23239

Backtrace

n/a

[AskAlexSharov]

here is PR: #2518