[ISSUE #1055] [Golang] Enhance grpc failover resilience

[takagi906]

Which Issue(s) This PR Fixes

Fixes #1066

Brief Description

1. Add nameResolver, endpoint's scheme is ipv4 or ipv6 can be resolved.
2. Optimized the sending method from sending to multiple endpoints sequentially to sending to all endpoints at once.

How Did You Test This Change?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.27%. Comparing base (4076e2b) to head (4183845).
⚠️ Report is 58 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1069      +/-   ##
============================================
+ Coverage     53.26%   53.27%   +0.01%     
+ Complexity      651      648       -3     
============================================
  Files           208      208              
  Lines         14303    13816     -487     
  Branches       5845     5524     -321     
============================================
- Hits           7619     7361     -258     
+ Misses         6308     6087     -221     
+ Partials        376      368       -8     

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[guyinyou]

lgtm