Added --help/-h Option to Clickhouse-server

Why it matters

The new --help/-h option improves user experience by providing an easy way to get usage instructions and available options directly from the clickhouse-server command, helping users understand how to run and configure the server without needing to consult external documentation.

How to use it

To use this feature, run the clickhouse-server command with either the --help or -h flag as follows:

clickhouse-server --help

or

clickhouse-server -h

This will display a help message with information about the server command-line options.