add ServerConn.ValidateCredentials()

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.01887% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 81.52%. Comparing base (1d60608) to head (a15a7ab).

Files	Patch %	Lines
server_conn.go	89.13%	4 Missing and 1 partial ⚠️
pkg/liberrors/server.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #555      +/-   ##
==========================================
+ Coverage   81.49%   81.52%   +0.02%     
==========================================
  Files         115      115              
  Lines       11474    11525      +51     
==========================================
+ Hits         9351     9396      +45     
- Misses       1721     1727       +6     
  Partials      402      402              

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