Feature Request: Add Additional Collection Fields to Donation Block

**What**
A user reached out requesting a way to collect emails, addresses, and phone numbers from folks donating via the Donations block.

**Why**
Being able to collect additional information from folks who are donating would allow organizations to pursue additional outreach and fundraising initiatives with the information collected.

**How**
I think the easiest thing layout-wise would be to add the fields below the amount information in the block, and above the actual donate button.

As far as how to actually work with the information and expose it to the user, I wonder if it would make sense to integrate it with existing contact form responses under "feedback" such that whenever someone donates, there's a feedback entry created with the content of the fields in the donation block.

**Additional context**
This was requested in 29110583-hc

The issue names the Donations block and existing contact form responses under “feedback,” but no files, tests, or entry points. Start by locating the block and its feedback-response handling, then clarify the data model and privacy expectations; done requires an agreed way to collect and expose email, address, and phone fields with coverage for the resulting behavior.

Written by the indexing model from the issue text.