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Allow Khepri post-migration step to not delete certain files or dirs

1

### Is your feature request related to a problem? Please describe. As the last step of migrating to Khepri (ie enabling the `khepri_db` feature flag) all Mnesia related files are...

Crash dump viewer: ignore allocator type from blocks size keys

1

When gathering info about the allocators (particularly the summaries), crashdump viewer filters "interesting allocator info". However recent crash dumps also contain allocator type in the key so for example "mbcs...

Minor: ranch_ssl:listen can return non-atom error reasons

2

According to the `ranch_transport` behaviour, `listen/1` callback should return only atoms as error reasons https://github.com/ninenines/ranch/blob/master/src/ranch_transport.erl#L31. However `ssl:listen` and hence `ranch_ssl:listen/1` can return more sophisticated error reasons as visible in [`ssl:format_error/1`](https://github.com/erlang/otp/blob/81986a722e2c34d3e238185b42577bbaf3e9d2d3/lib/ssl/src/ssl.erl#L4839-L4847)....