feat(options): add CSP support with trustedTypePolicy

[remdex]

What is the motivation for this pull request?

Feature

Closes #2224

What is the current behavior?

CSP based on ideas from remarkablemark/html-dom-parser#1439

What is the new behavior?

let trustedHtml = (window.trustedTypes && window.trustedTypes.createPolicy)
                ? window.trustedTypes.createPolicy('csp-react-html', {createHTML: function(s) { return s; }})
                : null;

root.render(parse('<h1>HTMLReactParser loaded with Webpack</h1>',{
   trustedTypePolicy : trustedHtml
}));

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (11370e5) to head (88a197f).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2220   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          126       127    +1     
  Branches        48        48           
=========================================
+ Hits           126       127    +1     

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[remarkablemark]

LGTM!

[remarkablemark]

Release:

• chore(master): release 6.1.0 #2225 (comment)