Export hessian type api

[LaurenceLiZhixin]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1911 (e5e2efa) into 3.0 (a0528f2) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              3.0    #1911      +/-   ##
==========================================
- Coverage   44.95%   44.92%   -0.03%     
==========================================
  Files         287      287              
  Lines       17130    17130              
==========================================
- Hits         7701     7696       -5     
- Misses       8616     8620       +4     
- Partials      813      814       +1     

Impacted Files	Coverage Δ
protocol/dubbo/impl/hessian.go	32.88% <100.00%> (ø)
cluster/loadbalance/ringhash/ring.go	84.50% <0.00%> (-2.82%)	⬇️
metrics/prometheus/reporter.go	33.33% <0.00%> (-1.70%)	⬇️

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