Set simple field naming rules with this qualifier

[atifaziz]

There was a time when prefixing field names with underscore (_) aided in visual inspection and avoided accidents from ambiguity, but static code analysers have changed the game and primary constructors have blurred the lines further so this PR:

• sets the rules for field names to be simple and without the underscore
• requires this qualification for fields
• makes it consistent for entire code base and enforces the rules to maintain the consistency

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (3de8b3f) 92.50% compared to head (2024e82) 92.50%.

Files	Patch %	Lines
MoreLinq/Reactive/Subject.cs	76.92%	2 Missing and 1 partial ⚠️
MoreLinq/CollectionLike.cs	66.66%	0 Missing and 2 partials ⚠️
MoreLinq/Delegating.cs	60.00%	0 Missing and 2 partials ⚠️
MoreLinq/ListLike.cs	71.42%	0 Missing and 2 partials ⚠️
MoreLinq/ReverseComparer.cs	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1050   +/-   ##
=======================================
  Coverage   92.50%   92.50%           
=======================================
  Files         112      112           
  Lines        3401     3403    +2     
  Branches     1056     1056           
=======================================
+ Hits         3146     3148    +2     
  Misses        189      189           
  Partials       66       66           

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