Extract component feature

[IIFelix]

Add new command for extracting selected text into new component.
Also add new docs entry.

[johnsoncodehk]

Thanks! I also have to investigate how to implement auto import component after extracted.

[johnsoncodehk]

After a long consideration, I decided not to add this feature for the following reasons. 🙏

• Extract component feature is not suitable for everyone. Some people may expect to only extract the template without making any script changes; some may expect to refactor the used properties into props at the same time.
• For implement props extraction, language server needs to add a new request API, and I want to avoid language server scope bigger.