Implementations rework

[sewcio543]

First PR with soupsavvy major version 1.0.0 rework, paving the way implementation-agnostic selectors.
Implementation of selectors does not depend on bs4, but on another layer of abstraction which is IElement - interface, that defines all functionality used across package.

All nodes, which implementation is supported need to be wrapped with appropriate element, that implements IElement interface and enable the use of selectors and all soupsavvy functionality.

Currently supported implementations are:

• bs4
• lxml
• selenium

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@              Coverage Diff              @@
##             dev/1.0.0      #207   +/-   ##
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  Coverage             ?   100.00%           
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  Files                ?        36           
  Lines                ?      1261           
  Branches             ?       197           
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  Hits                 ?      1261           
  Misses               ?         0           
  Partials             ?         0           

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