update block format to match geth

[noot]

Closes: #XXX

Description

fix block format to match geth, add mixHash, receiptsRoot, update previously empty fields to match geth as well. (possibly) fixes some tooling issues

geth's block format:

> eth.getBlock("latest")
{
  difficulty: 1024,
  extraData: "0x",
  gasLimit: 134217728,
  gasUsed: 0,
  hash: "0xbac73b3e5624e9be17da9092cd7deca59387d5a85eec2a5fabeb6eddacfad02e",
  logsBloom: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  miner: "0x3333333333333333333333333333333333333333",
  mixHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
  nonce: "0x0000000000000042",
  number: 0,
  parentHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
  receiptsRoot: "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
  sha3Uncles: "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  size: 507,
  stateRoot: "0x527e3174caed07d818aa6b33c91869e1c724385802486c9fe511f2e4c609bde9",
  timestamp: 0,
  totalDifficulty: 1024,
  transactions: [],
  transactionsRoot: "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
  uncles: []
}

block format w/ this PR:

> eth.getBlock("latest")
{
  difficulty: 0,
  extraData: "0x0",
  gasLimit: 4294967295,
  gasUsed: 0,
  hash: "0xaf449592191f27a59c13bc167ddcfc9c83d1a2377f03c72647a00efd3601f74f",
  logsBloom: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  miner: "0x0000000000000000000000000000000000000000",
  mixHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
  nonce: "0x0",
  number: 15,
  parentHash: "0x4cce796612caa31a6ef5c42840fbff82c58915c56a9ec95856805479a7cfcb56",
  receiptsRoot: "0x0000000000000000000000000000000000000000000000000000000000000000",
  sha3Uncles: "0x0000000000000000000000000000000000000000000000000000000000000000",
  size: 475,
  stateRoot: "0xf053b1d2820b05fbb9502bb56c88ac8952c477ccb6278ef441bd83719be2e854",
  timestamp: 1600877745,
  totalDifficulty: 0,
  transactions: [],
  transactionsRoot: "0x0000000000000000000000000000000000000000000000000000000000000000",
  uncles: []
}

---

For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

---

For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #532 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development     #532   +/-   ##
============================================
  Coverage        70.77%   70.77%           
============================================
  Files               41       41           
  Lines             2320     2320           
============================================
  Hits              1642     1642           
  Misses             536      536           
  Partials           142      142           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c1df065...bb63a21. Read the comment docs.

[araskachoi]

does it matter that extraData is "0x" on geth and "0x0" on ethermint?

[noot]

@araskachoi extraData is arbitrary data added by the miner, so it shouldn't make a difference