Alexandr Gorshenin

First iteration of Logstash plugin docs

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### Changelog category * Documentation (changelog entry is not required)

Add support of OAuth 2.0 Token Exchange

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Need to implement new credential providers based on https://www.rfc-editor.org/rfc/rfc8693

Update grcp codes mapping

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Fixes #253

Right [now](https://github.com/ydb-platform/ydb-java-sdk/blob/develop/core/src/main/java/tech/ydb/core/grpc/GrpcStatuses.java#L60-L70) few grpc statuses are converting to the corresponding StatusCodes, but all others are converting to CLIENT_INTERNAL_ERROR. This code is designed to describe client-side error, not server-side (like all...

Current implementation of sessions and the session pool doesn't include the control of the session state. And we often have next problems: 1. Usage of session after closing 2. Parallel...

YDB has support of DyNumber type, but SDK doesn't support it right [now](https://github.com/ydb-platform/ydb-java-sdk/blob/develop/table/src/main/java/tech/ydb/table/values/PrimitiveType.java#L66)

We want to add more easy way to use the coordination service, like it made in analogs (ZooKeeper, Curator etc. )