london hardfork check logic in json-rpc is not consistent with chain state

[yihuang]

System info: ethermint main

Steps to reproduce:

1. Start a chain with london hardfork disabled
2. Do a upgrade or gov proposal to set london_block to 0.
3. Query historical block with jsonrpc getBlockByNumber.
4. It'll treat the historical block as london block.

Expected behavior: it should match what's on the chain state.

Actual behavior: [What actually happened]

Additional info:

I think we can add BaseFee grpc query in evm module, which will check both london hardfork and feemarket module parameters. and json-rpc side call it with ContextWithHeight.