Removing unused fields from ReaderSettings

[Myllyenko]

Removing unused fields to avoid misconfiguration of a reader.

• Looks like maxLag and readFrom were added to ReaderSettings by mistake because they belong to TopicReadSettings.
• decompress is unused at least for now.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.38%. Comparing base (959538e) to head (c0d89f5).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #337      +/-   ##
============================================
+ Coverage     47.34%   47.38%   +0.04%     
  Complexity     1750     1750              
============================================
  Files           309      309              
  Lines         12463    12448      -15     
  Branches       1232     1232              
============================================
- Hits           5901     5899       -2     
+ Misses         6102     6089      -13     
  Partials        460      460              

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[pnv1]

Thank you for noticing! It's really better to just remove these options until they are used in any way