feat: seek quorum for readonly session

[kezhuw]

Closes #30.

[codecov]

Codecov Report

Attention: Patch coverage is 97.35450% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 84.63%. Comparing base (376b21d) to head (9deaf5a).

Files	Patch %	Lines
src/session/connection.rs	91.48%	4 Missing ⚠️
src/session/mod.rs	91.42%	3 Missing ⚠️
tests/zookeeper.rs	99.25%	2 Missing ⚠️
src/endpoint.rs	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   83.74%   84.63%   +0.88%     
==========================================
  Files          33       34       +1     
  Lines        4523     4750     +227     
==========================================
+ Hits         3788     4020     +232     
+ Misses        735      730       -5     

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