Add User Feedback support through a Widget

[bruno-garcia]

Sentry has a User Feedback feature that is able to show the feedback collected from a user following an error, or simply initiated by a user (without the need to be connected to an error/event).

• https://docs.sentry.io/product/user-feedback/

The feedback collection allows attaching trace information as well as Session Replay. In addition to other context like tags.
In terms of SDK support, in JS we added a web widget, that's easy to add to the screen:

• https://docs.sentry.io/platforms/javascript/user-feedback/

The goal is to add a similar capability to mobile SDKs.

This SDK already has a function called CaptureUserFeedback which requires an event_id to work. This is the 'original' support for feedback that required an event to tie the feedback to. It didn't allow attachments, or tags as those would go on the error anyway.

The new protocol allows for the feedback itself to be self contained.
The SDKs have a new method that represnets this new protocol: CaptureFeedback. The old one should be deprecated in favor of the new one

See:

• https://develop.sentry.dev/application-architecture/feedback-architecture/
• Support for captureFeedback function sentry-cocoa#4187

The widget has been added to the iOS SDK with quite a few features already. And is also being added to the other major SDKs:

• [EPIC] Feedback Widget for React Native sentry-react-native#4302
• User Feedback UI widget sentry-cocoa#4270
• Implement new user feedback widget sentry-java#3613
• https://github.com/getsentry/sentry-dart/blob/7954fb356f96f17127c41230af433bc9ce01233c/flutter/lib/src/feedback/sentry_feedback_widget.dart#L55

Some ideas are new and are not aligned across all SDKs, for example:

• Show user feedback dialog when a screenshot is detected sentry-dart#2541
  But ideally we have a similar behavior/look/feel as much as that makes sense. Things should be idiomatic (e.g: swiping down in the modal removes the feedback widget for example)

[jamescrosswell]

@bruno-garcia the new API to capture feedback has been implemented in #3981.

The widget is a trickier in .NET though. I built a UI into a couple of the samples:

• MAUI
• ASP.NET Core

But there are all kinds of ways people could be building their UI in .NET (Blazor, ASP.NET Core MVC, AJAX, SPA front ends, native Android/iOS UI, WinForms, UWP, WinUI, WPF, MAUI etc.).

Maybe we just contain the scope of this issue to building Widgets for MAUI and ASP.NET Core? Even those two, I think, will keep us busy with people requesting ways to style them and customise them etc.