ci(rust): add test coverage ci

[ShadowySpirits]

No description provided.

[codecov-commenter]

Codecov Report

Merging #489 (0d8dba0) into master (0bc9756) will increase coverage by 11.37%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             master     #489       +/-   ##
=============================================
+ Coverage     34.23%   45.60%   +11.37%     
  Complexity      646      646               
=============================================
  Files           195      207       +12     
  Lines          8839    11452     +2613     
  Branches        279     2892     +2613     
=============================================
+ Hits           3026     5223     +2197     
- Misses         5658     6004      +346     
- Partials        155      225       +70     

Flag	Coverage Δ
rust	84.07% <100.00%> (?)

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

Impacted Files	Coverage Δ
rust/src/model/common.rs	98.59% <ø> (ø)
rust/src/producer.rs	94.23% <100.00%> (ø)
rust/src/simple_consumer.rs	86.39% <100.00%> (ø)

... and 9 files with indirect coverage changes

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[aaron-ai]

Can you add a GitHub badge for Rust coverage on the README.md so that more people can see our high test coverage of the Rust client? Fantastic job!

[ShadowySpirits]

Can you add a GitHub badge for Rust coverage on the README.md so that more people can see our high test coverage of the Rust client? Fantastic job!

Please merge this pr at first, so that I could test the badge.