Make escape and it variants take a impl Into<Cow<str>> argument and implement From<(&'a str, Cow<'a, str>)> on Attribute

[Tpt]

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[Tpt]

Handy to easily create Attribute from owned values without having to play with lifetimes. Note sure if it's the best approach, feel free to suggest an other one or reject this PR.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 40.90909% with 13 lines in your changes missing coverage. Please review.

Project coverage is 60.19%. Comparing base (a9391f3) to head (786bee1).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/events/attributes.rs	0.00%	7 Missing ⚠️
src/events/mod.rs	0.00%	6 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #827      +/-   ##
==========================================
- Coverage   60.21%   60.19%   -0.02%     
==========================================
  Files          41       41              
  Lines       16021    16030       +9     
==========================================
+ Hits         9647     9650       +3     
- Misses       6374     6380       +6     

Flag	Coverage Δ
unittests	60.19% <40.90%> (-0.02%)	⬇️

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