Support for using ip address in discovery response.

[dcherednik]

This feature allow server to explicit show own ip address to set connection instead of DNS hostname resolving. Usefull in case of connection to k8s clusters where nodes (k8s pod) placed in cluster.local domain so external user has no ability to resolve it.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 54.54545% with 10 lines in your changes missing coverage. Please review.

Project coverage is 47.40%. Comparing base (fef5bde) to head (ce9981a).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
...src/main/java/tech/ydb/core/impl/YdbDiscovery.java	55.55%	2 Missing and 2 partials ⚠️
...n/java/tech/ydb/core/impl/pool/EndpointRecord.java	71.42%	1 Missing and 1 partial ⚠️
...a/tech/ydb/core/impl/pool/NettyChannelFactory.java	0.00%	2 Missing ⚠️
.../ydb/core/impl/pool/ShadedNettyChannelFactory.java	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #322      +/-   ##
============================================
+ Coverage     47.39%   47.40%   +0.01%     
- Complexity     1729     1732       +3     
============================================
  Files           305      305              
  Lines         12362    12380      +18     
  Branches       1233     1237       +4     
============================================
+ Hits           5859     5869      +10     
- Misses         6045     6049       +4     
- Partials        458      462       +4     

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