Adding app_data to ServiceConfig

[augustocdias]

PR Type

Adding app_data for ServiceConfig struct.

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

Currently it is not possible to register app_data through the App::configure builder.
This will essentially merge the app_data from the ServiceConfig with the App's.

[robjtede]

I think that this should include Scope::configure.

[codecov-io]

Codecov Report

Merging #1758 into master will increase coverage by 0.03%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##           master    #1758      +/-   ##
==========================================
+ Coverage   53.78%   53.82%   +0.03%     
==========================================
  Files         129      126       -3     
  Lines       12060    12071      +11     
==========================================
+ Hits         6487     6497      +10     
- Misses       5573     5574       +1     

Impacted Files	Coverage Δ
src/config.rs	92.55% <88.88%> (-0.56%)	⬇️
actix-http/src/extensions.rs	58.33% <100.00%> (+3.78%)	⬆️
src/app.rs	98.99% <100.00%> (+<0.01%)	⬆️
src/scope.rs	93.45% <100.00%> (+0.01%)	⬆️
actix-http/src/header/common/mod.rs	10.00% <0.00%> (-1.12%)	⬇️
actix-http/src/header/common/allow.rs
actix-http/src/header/common/expires.rs
actix-http/src/header/common/content_language.rs
actix-http/src/header/common/etag.rs
actix-http/src/header/common/last_modified.rs
... and 2 more

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