add ServerConn.VerifyCredentials()

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 5 lines in your changes missing coverage. Please review.

Project coverage is 82.07%. Comparing base (3409f00) to head (3ad3ef0).

Files with missing lines	Patch %	Lines
server_conn.go	92.85%	2 Missing and 1 partial ⚠️
pkg/liberrors/server.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #555      +/-   ##
==========================================
+ Coverage   82.05%   82.07%   +0.01%     
==========================================
  Files         121      121              
  Lines       12474    12515      +41     
==========================================
+ Hits        10236    10272      +36     
- Misses       1821     1825       +4     
- Partials      417      418       +1     

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