Add web::ReqData extractor

[jplatte]

PR Type

Feature

PR Checklist

• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• A changelog entry has been made for the appropriate packages.
• Format code with the latest stable rustfmt

Overview

Adds a ReqData extractor for request data / request extensions, analogous to web::Data.

[codecov-io]

Codecov Report

Merging #1729 into master will decrease coverage by 0.01%.
The diff coverage is 32.25%.

@@            Coverage Diff             @@
##           master    #1729      +/-   ##
==========================================
- Coverage   53.48%   53.46%   -0.02%     
==========================================
  Files         128      126       -2     
  Lines       11981    11998      +17     
==========================================
+ Hits         6408     6415       +7     
- Misses       5573     5583      +10     

Impacted Files	Coverage Δ
src/config.rs	93.10% <ø> (ø)
src/data.rs	94.39% <ø> (ø)
src/lib.rs	68.42% <ø> (ø)
src/request_data.rs	0.00% <0.00%> (ø)
src/web.rs	85.71% <ø> (ø)
src/scope.rs	93.43% <40.00%> (-0.66%)	⬇️
src/app_service.rs	86.80% <50.00%> (-1.31%)	⬇️
src/app.rs	98.98% <100.00%> (ø)
actix-http/src/h1/encoder.rs	62.90% <0.00%> (-0.41%)	⬇️
actix-http/src/h1/decoder.rs	62.88% <0.00%> (-0.35%)	⬇️
... and 20 more

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[robjtede]

Hey @jplatte. Would be cool to see this in to v3.2. If you don't have the bandwidth just say so I can polish it up.

[jplatte]

Yeah not sure when I'll get back to this. Would be great if you could finish it!

[robjtede]

I didn't seem to be able to push to this branch so created a new PR (#1748) that includes the original commits. Closing this one.