[ISSUE #555] Support transaction message for Rust SDK

[ShadowySpirits]

close #555

[codecov-commenter]

Codecov Report

Merging #556 (7a97a84) into master (af9c7e2) will increase coverage by 0.86%.
The diff coverage is 75.55%.

@@             Coverage Diff              @@
##             master     #556      +/-   ##
============================================
+ Coverage     45.97%   46.83%   +0.86%     
  Complexity      667      667              
============================================
  Files           207      208       +1     
  Lines         11503    11870     +367     
  Branches       2933     3300     +367     
============================================
+ Hits           5288     5559     +271     
- Misses         5985     6068      +83     
- Partials        230      243      +13     

Flag	Coverage Δ
rust	82.24% <75.55%> (-1.17%)	⬇️

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

Impacted Files	Coverage Δ
rust/src/lib.rs	100.00% <ø> (ø)
rust/src/session.rs	48.76% <28.88%> (-1.48%)	⬇️
rust/src/simple_consumer.rs	85.79% <50.00%> (-0.60%)	⬇️
rust/src/client.rs	82.90% <73.07%> (-2.88%)	⬇️
rust/src/model/message.rs	95.90% <73.17%> (-3.11%)	⬇️
rust/src/model/transaction.rs	82.29% <82.29%> (ø)
rust/src/producer.rs	92.78% <89.55%> (-1.45%)	⬇️
rust/src/conf.rs	74.34% <100.00%> (ø)

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[lizhanhui]

Looks good