Improve Public API

[thecoolwinter]

Description

Makes some slight adjustments to the public API.

• Adds new, optional, controllerDidAppear/Disappear methods to text coordinators.
• Makes the textView and scrollView properties on the text view controller have public getters.

Related Issues

Related to issues brought up on Discord.

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

Screenshots

No UI Changes