Contextualized user recipient

Created a new MR.

My steps for testing
1. Created a new node type. e.g. Mail.
2. Created a new contact form on /admin/structure/contact/add page:
- label - context test
- recipients - test@test.com
- message - my message
3. Created a new contact email on /admin/structure/contact/emails/add page:
- contact form - context test
- subject - context test
- recipient type - The context entity author's email
4. Installed Contact Block → module.
5. Added the block with the contact form with visibility - content type = Mail
6. Created a new mail node as user1.
7. Submitted the contact form on the node page as user2.

result: a new mail to user1 was sent.

Merged the MR.

Automatically closed - issue fixed for 2 weeks with no activity.