fix: eth: correctly encode and simplify native input/output encoding

[simlecode]

关联的Issues (Related Issues)

close https://github.com/filecoin-project/venus/issues/6220

改动 (Proposed Changes)

附注 (Additional Info)

自查清单 (Checklist)

在你认为本 PR 满足被审阅的标准之前，需要确保 / Before you mark the PR ready for review, please make sure that:

• [ ] 符合Venus项目管理规范中关于PR的相关标准 / The PR follows the PR standards set out in the Venus project management guidelines
• [ ] 具有清晰明确的commit message / All commits have a clear commit message.
• [ ] 包含相关的的测试用例或者不需要新增测试用例 / This PR has tests for new functionality or change in behaviour or not need to add new tests.
• [ ] 存在兼容性问题（接口, 配置，数据，灰度），如果存在需要进行文档说明 / This PR has compatibility issues (API, Configuration, Data, GrayRelease), if so, need to be documented.
• [ ] 包含相关的的指南以及文档或者不需要新增文档 / This PR has updated usage guidelines and documentation or not need
• [ ] 通过必要的检查项 / All checks are green

[codecov-commenter]

Codecov Report

Merging #6242 (f058c6e) into master (e926936) will increase coverage by 0%. Report is 1 commits behind head on master. The diff coverage is 77%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6242 +/- ## ====================================== Coverage 25% 25% ====================================== Files 636 636 Lines 78063 78015 -48 ====================================== + Hits 20224 20255 +31 + Misses 55172 55094 -78 + Partials 2667 2666 -1 ```