extract more config types from Data<T> as well

[robjtede]

PR Type

Feature

PR Checklist

Check your PR fulfills the following:

• 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

Follow up to #1610. Extracts Form and Json config objects as T and then tries Data<T> as well.

[codecov-commenter]

Codecov Report

Merging #1641 into master will increase coverage by 0.09%.
The diff coverage is 97.61%.

@@            Coverage Diff             @@
##           master    #1641      +/-   ##
==========================================
+ Coverage   53.07%   53.17%   +0.09%     
==========================================
  Files         122      126       +4     
  Lines       11803    11836      +33     
==========================================
+ Hits         6265     6294      +29     
- Misses       5538     5542       +4     

Impacted Files	Coverage Δ
src/types/form.rs	81.81% <93.75%> (+2.53%)	⬆️
src/types/json.rs	90.82% <100.00%> (+0.76%)	⬆️
src/types/payload.rs	86.30% <100.00%> (-0.17%)	⬇️
actix-http/src/header/common/accept.rs	0.00% <0.00%> (ø)
actix-http/src/header/common/accept_charset.rs
actix-http/src/header/common/expires.rs	0.00% <0.00%> (ø)
...ctix-http/src/header/common/if_unmodified_since.rs	0.00% <0.00%> (ø)
actix-http/src/header/common/if_modified_since.rs	0.00% <0.00%> (ø)
actix-http/src/header/common/accept_language.rs	0.00% <0.00%> (ø)
actix-http/src/header/common/content_language.rs	0.00% <0.00%> (ø)

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[robjtede]

@actix/contributors could use your help to get v3 over the last couple hurdles :D

[fakeshadow]

looks great to me and I like this approach than a single type of app state