[v10] Fix argparser issue

[basfroman]

This PR refactors the Config class to dynamically respect the BT_NO_PARSE_CLI_ARGS environment variable, ensuring CLI argument parsing is enabled by default and can be explicitly disabled when needed.
This change prevents SDK crashes when it is used within external scripts that define their own CLI arguments overlapping with the SDK’s.

• The environment variable is recognized when set to any of the following case-insensitive values: 1, true, yes, or on.
• By default, BT_NO_PARSE_CLI_ARGS is not set, and CLI argument parsing remains active.
• The local environment variable BT_NETWORK has been renamed to BT_SUBTENSOR_NETWORK for consistency with other Subtensor-related settings.

@MichaelTrestman — please note that the documentation needs to be updated to reflect:

• the new environment variable BT_NO_PARSE_CLI_ARGS, and
• the renamed variable BT_SUBTENSOR_NETWORK.

[thewhaleking]

Nice!