add csp nonce attribute to style tags (#20309)

[nzwz]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	#20309
What attribute should be added to the style tag?

Only the nonce
Nonce use-case is easy to find in the API docs
Less flexible

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.85%. Comparing base (d146307) to head (08bf334).

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #20310   +/-   ##
=========================================
  Coverage     64.84%   64.85%           
- Complexity    11433    11435    +2     
=========================================
  Files           431      431           
  Lines         37187    37190    +3     
=========================================
+ Hits          24115    24118    +3     
  Misses        13072    13072           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[samdark]

👍 Need a line for CHANGELOG.

[nzwz]

👍 Need a line for CHANGELOG.

Thanks @samdark.

• Add custom attributes support to style tags.

[samdark]

@nzwz I've meant adding the line to https://github.com/yiisoft/yii2/blob/master/framework/CHANGELOG.md