Problem: tx format conversions not necessary

[yihuang]

Closes: #471

Solution:

• embed ethtypes.Transaction type inside the protobuf message directly.

$ go test -benchmem -v ./app/... -run "^$" -bench="BenchmarkERC20Transfer/memiavl-stm-16" -count 6
$ benchstat /tmp/before /tmp/after
goos: darwin
goarch: arm64
pkg: github.com/crypto-org-chain/cronos/v2/app
                                │ /tmp/before │            /tmp/after             │
                                │   sec/op    │   sec/op     vs base              │
ERC20Transfer/memiavl-stm-16-16   134.0m ± 2%   127.1m ± 4%  -5.11% (p=0.002 n=6)

                                │ /tmp/before  │             /tmp/after             │
                                │     B/op     │     B/op      vs base              │
ERC20Transfer/memiavl-stm-16-16   538.5Mi ± 0%   487.3Mi ± 0%  -9.51% (p=0.002 n=6)

                                │ /tmp/before │             /tmp/after             │
                                │  allocs/op  │  allocs/op   vs base               │
ERC20Transfer/memiavl-stm-16-16   7.353M ± 0%   6.263M ± 0%  -14.82% (p=0.002 n=6)

Description

---

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

Attention: Patch coverage is 68.80000% with 78 lines in your changes are missing coverage. Please review.

Project coverage is 61.71%. Comparing base (40463e8) to head (c323cd4).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #478      +/-   ##
===========================================
- Coverage    62.93%   61.71%   -1.22%     
===========================================
  Files          126      127       +1     
  Lines         9480     9442      -38     
===========================================
- Hits          5966     5827     -139     
- Misses        2974     3077     +103     
+ Partials       540      538       -2     

Files	Coverage Δ
app/ante/fees.go	76.81% <100.00%> (+1.13%)	⬆️
app/ante/setup.go	83.60% <100.00%> (+2.35%)	⬆️
indexer/kv_indexer.go	70.17% <100.00%> (+0.53%)	⬆️
rpc/backend/blocks.go	86.46% <100.00%> (-0.11%)	⬇️
rpc/types/utils.go	0.00% <ø> (ø)
x/evm/keeper/config.go	93.75% <100.00%> (ø)
x/evm/keeper/gas.go	86.95% <100.00%> (ø)
x/evm/keeper/hooks.go	100.00% <100.00%> (ø)
x/evm/keeper/keeper.go	85.84% <100.00%> (ø)
x/evm/keeper/state_transition.go	74.46% <100.00%> (+0.78%)	⬆️
... and 13 more

... and 3 files with indirect coverage changes

[mmsqe]

seems we might also need fix the data for raw