crypto/tss/ecdsa/cggmp/refresh: add some get-functions of Result

[cychuang0924]

Before submitting a pull request, please make sure the following is done:

Checklist

• Fork the repository and create your new branch from master.
• Please mention the name of community in Pull Request title.
• Git Commit Messages
  • Use the present tense (Also in Pull Request title): "Add feature" not "Added feature"
  • Use the imperative mood (Also in Pull Request title): "Move cursor to..." not "Moves cursor to..."
  • Use rebase to squash/fixup dummy/unnecessary commits into only one commit.

[codecov]

Codecov Report

Base: 80.56% // Head: 80.44% // Decreases project coverage by -0.12% ⚠️

Coverage data is based on head (da71f47) compared to base (3e87dc7).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
- Coverage   80.56%   80.44%   -0.13%     
==========================================
  Files         143      143              
  Lines       11192    11202      +10     
==========================================
- Hits         9017     9011       -6     
- Misses       1370     1384      +14     
- Partials      805      807       +2     

Impacted Files	Coverage Δ
crypto/tss/ecdsa/cggmp/refresh/round_3.go	52.59% <0.00%> (-4.21%)	⬇️
crypto/zkproof/paillier/nth_rooot.go	86.36% <0.00%> (-4.55%)	⬇️
crypto/zkproof/paillier/blummodzkproof.go	79.33% <0.00%> (-4.00%)	⬇️
crypto/zkproof/paillier/operation_commitment.go	92.96% <0.00%> (+1.00%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.