fix!: london hardfork check logic in json-rpc apis

[yihuang]

Description

Closes: #1067
Solution:

• Add BaseFee grpc query handler in evm module which also checks the current london hardfork status.

the eth_getBlockByNumber rpc api is tested in cronos's related PR: https://github.com/crypto-org-chain/cronos/pull/446/files#diff-ece6d4f65047a3ec6f2294c4e4fc1eecf8a2b44928f478867399e69f194fc1beR128

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• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
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[codecov]

Codecov Report

Merging #1068 (c3b27c8) into main (fb13fd4) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1068      +/-   ##
==========================================
+ Coverage   60.79%   60.87%   +0.07%     
==========================================
  Files          80       80              
  Lines        6670     6683      +13     
==========================================
+ Hits         4055     4068      +13     
  Misses       2404     2404              
  Partials      211      211              

Impacted Files	Coverage Δ
app/ante/eth.go	82.42% <100.00%> (ø)
x/evm/keeper/grpc_query.go	69.24% <100.00%> (+0.93%)	⬆️
x/evm/keeper/keeper.go	78.70% <100.00%> (ø)
x/evm/keeper/state_transition.go	75.54% <100.00%> (ø)

[fedekunze]

LGTM with minor comments.

Can you also add the new query to the spec and CLI? Should we remove the fee market gRPC base fee query?