📝 Write a test for custom
handle_error and handle_async_error types (#110)Our endpoints have two methods to handle custom errors: https://github.com/wemake-services/django-modern-rest/blob/17edd60e1d13b88f4ee2c229095c237b1919b415/djangomodernrest/endpoint.py#L118-L132
But, they are not tested to be customized. Please, add two cases with:
1. Async endpoint and
handle_async_error that custom errors can be serialized to json the right way2. Sync endpoint and
handle_error with the same logic#helpwanted #goodfirst_issue #enhancement
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