[A11y] Add annoncements when a bulleted and numbered lists are created

[vhuseinova-msft]

Describe the bug Currently RoosterJS allow to customize strings for announcing announceListItemBullet, announceListItemNumbering and announceOnFocusLastCell. This GitHub issue is for adding a few new options when:

• a bulleted list is added
• a numbered list is added. The announcement should be used when bulleted/numbered lists are added as part of autoformatiing and when toggleBullet/toggleNumbering apis are called.

To Reproduce Steps to reproduce the behavior:

1. Open RoosterJS demo app
2. Add a numbered/bulleted list
3. Observe that there is no announcements that lists are created (and there is no options to set this in code)

Expected behavior Developers are able to add/customize strings that will be used when bulleted/numbered lists are created.  

Device Information

• OS: [e.g. iOS] MacOs
• Browser [e.g. chrome, safari] Edge
• Version [e.g. 22]

[vhuseinova-msft]

cc @BryanValverdeU

[BryanValverdeU]

@vhuseinova-msft We are just going to set the announcing when the list is created with AutoFormat, When the function toggleNumbering or toggleBullet is triggered from a button, other apps like Word do not announce the action.

A work around if you want to announce when the action is triggered with a button is to call editor.announce(...announceData).