Implement 'osnadmin channel info' subcommand and update tests #4890

[Priyansurout]

Implemented the osnadmin channel info subcommand to retrieve detailed information about a specific channel from an Ordering Service Node (OSN). This involved modifying the CLI commands and adding corresponding functionality to interact with the channel participation API.

Type of change New feature Implemented the osnadmin channel info subcommand to retrieve detailed information about a specific channel from an Ordering Service Node (OSN).

Introduced info subcommand under osnadmin channel to support querying individual channel details. Updated existing tests and added new tests to cover the new feature and edge cases.