Sentry integration (#591)

Use sentry echo integration to send errors

Only capture errors not already handled by echo

Add sentry panic handler

Add sentry library

Add sentry init

Add sentry config

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/591

docs/content/doc/setup/config.md

@@ -75,6 +75,8 @@ service:
   enabletaskcomments: true
   # Whether totp is enabled. In most cases you want to leave that enabled.
   enabletotp: true
+  # If not empty, enables logging of crashes and unhandled errors in sentry.
+  sentrydsn: ''
 
 database:
   # Database type to use. Supported types are mysql, postgres and sqlite.