utilize weakdeps

[aplavin]

wherever possible.
No breaking changes.
And the code itself didn't change at all, it's just github diff isn't the best with file renaming + code moving.

[codecov]

Codecov Report

Attention: Patch coverage is 94.30380% with 9 lines in your changes missing coverage. Please review.

Project coverage is 89.59%. Comparing base (44abdc4) to head (cd92a10).

Files with missing lines	Patch %	Lines
ext/RecipesBaseExt.jl	94.23%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
- Coverage   90.05%   89.59%   -0.46%     
==========================================
  Files          20       20              
  Lines        1156     1153       -3     
==========================================
- Hits         1041     1033       -8     
- Misses        115      120       +5     

Flag	Coverage Δ
unittests	89.59% <94.30%> (-0.46%)	⬇️

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