RPC eth_getBlockByNumber does not work as expected

[banishee]

System info: [Include Ethermint commit, operating system name, and other relevant details]

• branch dev

Steps to reproduce:

1. If a developer calls this api, he will only get all the hashes of the transactions in a block, not the full transaction objects

Expected behavior: [What you expected to happen]

• Based on document from https://eth.wiki/json-rpc/API, a developer can theoretically choose what type of return results to get
  

Actual behavior: [What actually happened]

• In ethermint project, it only returns one type of result —— the hashes of the transactions
  

  ethermint/rpc/types/utils.go

  Line 181 in fae8147

  "transactions": transactions.([]common.Hash),

Additional info: [Include gist of relevant config, logs, etc.]

[github-actions]

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