feat: Create a Deserializer from a custom NsReader

[xdm67x]

Why?

Such as me, some users wants to be able to configure the Reader to match their needs. With the recent changes on the trim_text I wanted to find a way to satisfy everyone and also my needs.

How?

Add a From implementation to create a Deserializer using a custom NsReader.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 15.78947% with 16 lines in your changes missing coverage. Please review.

Project coverage is 55.25%. Comparing base (254fbd2) to head (c98671c).
Report is 50 commits behind head on master.

Files with missing lines	Patch %	Lines
src/de/mod.rs	15.78%	16 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #882      +/-   ##
==========================================
- Coverage   60.74%   55.25%   -5.50%     
==========================================
  Files          41       42       +1     
  Lines       16044    15353     -691     
==========================================
- Hits         9746     8483    -1263     
- Misses       6298     6870     +572     

Flag	Coverage Δ
unittests	55.25% <15.78%> (-5.50%)	⬇️

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