feature(engine, extension): Prototype for screen reader emulator functions

[tombrunet]

• New Rule(s): List rule IDs
• New or modified help files: List rule IDs
• Rule bug: List rule IDs
• Extension UI bug
• Automated tool bug
• Other (Provide information)

This PR is related to the following issue(s):

Testing reference:

I have conducted the following for this PR:

• I validated this code in Chrome and FF
• I validated this fix in my local env
• I provided details for testing
• This PR has been reviewed and is ready for test
• I understand that the title of this PR will be used for the next release notes.

Assets to aide review attached

• Links to design artifacts
• Links to video walkthrough of user experience
• Other

Definition of Done

• Peer review complete
• Secondary review complete
• Staging deployment verified