Allow attachments to be uploaded to crash events

[cstavitsky]

Problem Statement

Opening as the result of a customer conversation:

Currently the docs say:

Adding attachments to crashes is currently not supported.

It would be useful to be able to add attachments to crashes, for example log files.

Solution Brainstorm

No response

Are you willing to submit a PR?

No response

Notes:

This probably wouldn't be a simple change - Internally on slack, @armcknight noted:

that’ll probably need something much more comprehensive like an RFC, because it would probably be a change to the SDK protocol and require backend/frontend changes