refactor: 移除对全局参数的缓存 / remove cached shared params

[simlecode]

关联的Issues (Related Issues)

resolve filecoin-project/venus#5234

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.
• 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 #256 (b3d065c) into master (308f6ab) will decrease coverage by 0.14%.
The diff coverage is 61.11%.

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
- Coverage   54.75%   54.61%   -0.15%     
==========================================
  Files          63       63              
  Lines        6757     6740      -17     
==========================================
- Hits         3700     3681      -19     
- Misses       2767     2768       +1     
- Partials      290      291       +1     

Flag	Coverage Δ
unittests	54.61% <61.11%> (-0.15%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
service/message_service.go	60.46% <40.00%> (-0.16%)	⬇️
service/shared_params_service.go	62.50% <66.66%> (-7.96%)	⬇️
service/message_selector.go	86.25% <70.00%> (-0.98%)	⬇️

[diwufeiwen]

LGTM