Problem: ethermint json-rpc fixes are not backported (crypto-org-chai…

…n#932)

* Problem: tx delivery performance is not benchmarked (crypto-org-chain#916)

Solution:
- add the first benchmark for tx delivery

* Problem: go 1.20.2 is not used (crypto-org-chain#926)

* Problem: go 1.20.2 is not used

Solution:
- update nixpkgs to recent master
- re-enable coverage report for integration tests

* enlarge timeout

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Co-authored-by: mmsqe <mavis@crypto.com>

* Problem: eth tx sender recovery is slow (crypto-org-chain#928)

* Problem: eth tx sender recovery is slow

Solution:
- update ethermint dependency, do it once in ante handler and cache
the result

* fix build

* update upstream

* fix lint

* fix versiondb

* fix memiavl

* fix upgrade integration test

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Co-authored-by: mmsqe <mavis@crypto.com>

* fix lint

* fix test

* point to rpc fix only

* no report coverage

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Co-authored-by: yihuang <huang@crypto.com>