added hardware instance mapping api to cli

[Dhruv-Mehndhiratta-Centml]

• added hardware instance mapping api, removed hard coded value of it from the cli
• added cached pattern for using the api response so that it doesn't end up calling api again and again

[Dhruv-Mehndhiratta-Centml]

Hey @anandj91 i have noticed in case of get_hardware_instances_hardware_instances_get in external_api generator we are not setting up auth_settings as https bearer , its resulting into giving rbac access denied error for this particular api because its not having access token inside its request, however if i manually add or update this to below mentioned change, this api request start passing and resulting into 200 success response, this is also applicable for the prebuild images api too.

 # authentication setting
    _auth_settings: List[str] = [
        'HTTPBearer'
    ]

let me check how can i add this to generated client permanently so that it can act as a permanent fix for this api