Added requestedAuthnContextComparison to security configuration

[nexxome]

This PR added requestedAuthnContextComparison to security configuration:

    // Allows the authn comparison parameter to be set, defaults to 'exact' if 
    // the setting is not present.
    'requestedAuthnContextComparison' => 'exact',

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.79%. Comparing base (8f6d83f) to head (fd59708).
Report is 2 commits behind head on 2.0.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/DependencyInjection/Configuration.php	100.00% <100.00%> (ø)

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[a-menshchikov]

@nexxome thank you for your contribution.
Could you rebase this PR to the 1.4 branch? After merge I will spread it into the 2.0.