No JSON/RPC endpoint exists to determine which EVM version a permissioned chain is using

[matthew1001]

Description

The admin_nodeInfo JSON/RPC method returns the configuration of a node which includes its fork schedule, but you have to manually derive which schedule is in use by correlating it with the chain's block height and/or timestamp.

It would be useful to have a JSON/RPC method that returned the EVM version in use for the latest block.

One additional enhancement would be the ability to specify a block number and get back the EVM version in use at that block height, but the use-case for that is less clear than for latest

Acceptance Criteria

A JSON/RPC method exists to determine the EVM version in use on the current/latest block height.