Add functionality to strip whitespace from annotations.

[NickHilton]

Feature

Adds an option to the component so that if a user highlights some text with leading or trailing whitespace, that whitespace can be automatically stripped.

We noticed a lot of our annotations were being saved with leading/trailing whitespace accidentally so want the option in this component to adjust that.

Currently we can post process the annotations but this allows it to happen in the UI as well.

Changes

• Add python argument strip_whitespace: bool = False to the main component, preserving current behaviour
• Add typescript argument strip_whitespace to strip annotations after they have been selected in the UI and update the internal store of annotations to reflect that

Testing

• Spun up local server and got desired behaviour with/without strip_whitespace turned on