[code-coverage] use cargo llvm-cov to generate coverage info

[jiangying000]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: #3666

What is the new behavior?

• the core dump mention in Maybe the coverage report has a bug, the coverage is suddenly reduced. Diem project does some report hack. https://app.codecov.io/gh/starcoinorg/starcoin #3666 is hard to deal with and it's using debug info to collect cov data, so maybe use another approach to collect coverage info
• use cargo llvm-cov to gen coverage info

Other information

[codecov]

Codecov Report

Merging #3693 (f7fb529) into master (8bd77a6) will increase coverage by 26.79%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #3693       +/-   ##
===========================================
+ Coverage   28.45%   55.24%   +26.79%     
===========================================
  Files         588      597        +9     
  Lines       50412    64304    +13892     
  Branches    23644        0    -23644     
===========================================
+ Hits        14342    35516    +21174     
- Misses      22172    28788     +6616     
+ Partials    13898        0    -13898     

Flag	Coverage Δ
unittests	55.24% <ø> (+26.79%)	⬆️

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

Impacted Files	Coverage Δ
vm/transaction-builder-generator/src/lib.rs	1.52% <0.00%> (-98.48%)	⬇️
cmd/generator/src/lib.rs	3.85% <0.00%> (-96.15%)	⬇️
cmd/peer-watcher/src/lib.rs	6.25% <0.00%> (-93.75%)	⬇️
vm/types/src/write_set.rs	45.46% <0.00%> (-18.64%)	⬇️
vm/types/src/transaction/helpers.rs	9.38% <0.00%> (-17.89%)	⬇️
cmd/indexer/src/lib.rs	50.68% <0.00%> (-15.99%)	⬇️
network-p2p/src/protocol/event.rs	16.67% <0.00%> (-11.90%)	⬇️
commons/utils/src/mpsc.rs	42.86% <0.00%> (-8.92%)	⬇️
vm/move-package-manager/src/lib.rs	0.54% <0.00%> (-7.16%)	⬇️
commons/time-service/src/lib.rs	65.79% <0.00%> (-7.12%)	⬇️
... and 561 more

---

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[jiangying000]

failed to upload report: https://github.com/starcoinorg/starcoin/runs/8075909445?check_suite_focus=true#step:8:48

    {'detail': ErrorDetail(string='Unable to locate build via Github Actions API. Please upload with the Codecov repository upload token to resolve issue.', code='not_found')}

relate to: codecov/codecov-action#557

retry like: redhat-plumbers-in-action/differential-shellcheck#79

[jolestar]

LGTM