Make Thunder SDK Caches Configurable

[adamdama]

The thunder_ripple_sdk has caching implemented around all of the device_info calls that are made to Thunder. This will make testing or local development with the Mock Device extension very difficult as there is no way to clear the cache after the first call of any particular method is made.

We need to add the ability to disable this cache in certain environments. This should be done by updating the extn manifest to have a property which enables or disables this cache.

I am not sure what the best way to express this is in the extn manifest file as this property would be generic to this specific extension. It also doesn't seem right to place the config in the device manifest. Maybe we need to have a settings field in the extn manifest where extensions can define their own options.

[satlead]

Right now we have a config field in the extension manifest for such requirements.
Here is an example

A distributor can set the

{
            "path": "libthunder",
            "symbols": [
                {
                    "id": "ripple:channel:device:thunder",
                    "config": {
                         "disable_device_info_caching": true
                     }
                    "uses": [
                        "config"
                    ],
                    "fulfills": [
                        "device_info",
                        "window_manager",
                        "browser",
                        "wifi",
                        "device_events",
                        "device_persistence",
                        "remote_accessory"
                    ]
                }
            ]
        },

Then one can do extn_client.get_bool_config("disable_device_info_caching")