Ability to configure default page size

[Vad1mo]

I would be beneficial to be able to configure the default page size for different harbor cli operations.

[Roaster05]

@Vad1mo To address this issue, we can introduce a global default page size setting for the Harbor CLI. Users can configure this via the CLI configuration file (config.yaml) or an environment variable (HARBOR_CLI_DEFAULT_PAGE_SIZE).

The logic would follow a priority hierarchy:

1. Command Line Flag: If --page-size is explicitly provided, it takes precedence.
2. Configuration Setting: Use the value from the config file or environment variable if no flag is set.
3. Fallback: Default to the existing hardcoded value (X) if neither is configured.
   This approach maintains backward compatibility while providing flexibility for users to define their preferred page size across CLI operations