feat(Logging): Add Sentry SDK to report errors at the backend

Georg Krause requested to merge sentry-api into develop

There are two options to configure the current implementation using env vars: FUNKWHALE_SENTRY_DSN needs to be set to enable the loggin to a Sentry DSN. FUNKWHALE_ENTRY_SR allows to configure the sample rate, see https://docs.sentry.io/platforms/python/configuration/sampling/

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