add app start instrumentation for xamarin (forms)

[hot33331]

For native android/ios and flutter app start instrumentation is already implemented. This is also a very important KPI for Xamarin and would be highly appreciated.

[lucas-zimerman]

This and #106 are going to be solved once we integrate the Sentry Xamarin SDK with the Native SDKs

[hot33331]

Any rough timeline on that?

[bruno-garcia]

do you have plans to move to MAUI?
Apps are supposedly easy to convert, and MAUI is GA"ing soon.

We are very interested in investing in MAUI going forward and adding the native crash support straight into the .NET (e.g: getsentry/sentry-dotnet#1288) and we'd love to collaborate with the community on this

[hot33331]

Hi Bruno, yes, since Xamarin support will be discontinued 1 year after GA (as far as I know), we will switch to MAUI. No concrete timeline on that so far though, since dates for GA of MAUI were vage (Q2/22) and changing (e.g. from .net 6 GA to Q22). I guess within 1 year after GA... ;-) How can I help?

[bruno-garcia]

We track MAUI here: getsentry/sentry-dotnet#1174

[mattjohnsonpint]

Hi. We won't fix this for Xamarin, but will for MAUI (getsentry/sentry-dotnet#1174). Thanks.