Daniil Cherednik

bug: signal SIGSEGV in case of missed database in connection string

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# Bug Report **YDB GO SDK version:** trunk **Environment** linux **Current behavior:** segfault **Expected behavior:** not segfault **Steps to reproduce:** - build example from ydb-go-sdk/examples/describe - run: ./describe -ydb "grpc://127.0.0.1:28048"...

In case of network reconnect or tablet restart topic reader can read uncommitted messaged which was already read. The one solution is to use callback https://github.com/ydb-platform/ydb-go-sdk/blob/bcbe6502c6f9e5550349f67e2769d0066d68c16f/topic/topicoptions/topicoptions_reader.go#L234-L234 but this is not...

Switch default dns resolver type for stream-nb branch

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### Changelog entry ### Changelog category * Not for changelog (changelog entry is not required) ### Description for reviewers ...