In `sentry-tracing`, enable `EventFilter::Log` by default when `enable_logs: true`

### Problem Statement

When the SDK is initialized with `enable_logs: true`, the user also needs to set up a custom mapping to `EventFilter::Log` in order to get logs.
This is confusing and it's easy to miss.

### Solution Brainstorm

When the SDK is initialized with `enable_logs: true`, map everything that would go to breadcrumbs also to logs in the default filter.