Allow to save unparsed records and errors in RabbitMQ, NATS and FileLog engines

[Avogar]

Changelog category (leave one):

• New Feature

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Allow to save unparsed records and errors in RabbitMQ, NATS and FileLog engines. Add virtual columns _error and _raw_message(for NATS and RabbitMQ), _raw_record (for FileLog) that are filled when ClickHouse fails to parse new record. The behaviour is controlled under storage settings nats_handle_error_mode for NATS, rabbitmq_handle_error_mode for RabbitMQ, handle_error_mode for FileLog similar to kafka_handle_error_mode. If it's set to default, en exception will be thrown when ClickHouse fails to parse a record, if it's set to stream, erorr and raw record will be saved into virtual columns. Closes #36035

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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[robot-ch-test-poll]

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[kssenii]

allowed can probably be deleted now from this class, seems it is unused after this change

[deevil]

For error messages length(_error) > 0 is correct.

But for good messages check length(_error) = 0 not working.
length(_error) is equal NULL

Engine RabbitMQ

[Avogar]

For RabbitMQ, NATS and FileLog I made columns _error and _raw_record Nullable, it's more natural. In Kafka I didn't change it for compatibility reasons. You should check if there is an error by checking _error is not Null (and for good records _error is Null)

[deevil]

@Avogar it's cool.
But not documented(

[Avogar]

But not documented(

Thanks for noticing it, I will add this to documentation