Adjust maximum value and description of compression.level config to respect zstd specific values

[antaljanosbenjamin]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the configuration for compression.level to properly support zstd compression levels. The maximum compression level constant is increased from 12 to 22, and the documentation is updated to include the valid range for zstd compression.

Key Changes:

• Updated RD_KAFKA_COMPLEVEL_MAX constant from 12 to 22 to accommodate zstd's maximum compression level
• Enhanced documentation string to include zstd's valid compression level range [0-22]

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/rdkafka_conf.h	Updated the maximum compression level constant to support zstd
src/rdkafka_conf.c	Added zstd compression level range to the configuration property description

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