Allow extension of `FeaturesRouter`

[dblythy]

New Feature / Enhancement Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.

Current Limitation

Currently, the FeaturesRouter tells the dashboard which features are available or not. However, it does not currently check if securityChecks are enabled, if there's a push adapter, etc.

Feature / Enhancement Description

FeaturesRouter should be extended

Example Use Case

Alternatives / Workarounds

3rd Party References

[parse-github-assistant]

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[parseplatformorg]

🎉 This change has been released in version 7.1.0-alpha.2

[parseplatformorg]

🎉 This change has been released in version 7.1.0-beta.1

[parseplatformorg]

🎉 This change has been released in version 7.1.0