Support property Text in DocumentDropOrPasteEditKind

[rschnekenbu]

What it does

This PR introduces the new static readonly TEXT property in DocumentDropOrPasteEditKind in the documentPaste proposed API. It is intialized to its value in types-impl file. It will be later used by other extensions to build additional kinds or to specifiy yieldTo informations. See for example::

• https://github.com/Microsoft/vscode/blob/5410686643f746d444c3379690113a84351ec9e5/extensions/markdown-language-features/src/languageFeatures/updateLinksOnPaste.ts#L70
• https://github.com/Microsoft/vscode/blob/5410686643f746d444c3379690113a84351ec9e5/extensions/typescript-language-features/src/languageFeatures/copyPaste.ts#L45

fixes #14603

How to test

You can simply build the typescript or markdown extension using this API and check if errors are provided at startup or runtime.

Follow-ups

None

Breaking changes

• This PR introduces breaking changes and requires careful review. If yes, the breaking changes section in the changelog has been updated. - NO breaking changes

Attribution

contributed on behalf of STMicroelectronics

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines