Implement Astarte client component

[ackermannW]

• Implement Astarte client component
• For now, Astarte client should be able to fetch data from Edgehog related interfaces

Data to be retrieved:

• CPU architecture
• CPU model code
• CPU model name
• CPU vendor
• Total memory

These data can be retrieved from the following Astarte interfaces:

• io.edgehog.devicemanager.HardwareInfo for CPU model name, architecture, totalBytes, CPU vendor and model(model code)

Full interface definition is:

{
    "interface_name": "io.edgehog.devicemanager.HardwareInfo",
    "version_major": 0,
    "version_minor": 1,
    "type": "properties",
    "ownership": "device",
    "description": "General hardware capabilities",
    "mappings": [
        {
            "endpoint": "/cpu/vendor",
            "type": "string",
            "description": "CPU Vendor"
        },
        {
            "endpoint": "/cpu/modelName",
            "type": "string",
            "description": "CPU Model Display Name"
        },
        {
            "endpoint": "/cpu/architecture",
            "type": "string",
            "description": "CPU Architecture "
        },
        {
            "endpoint": "/cpu/model",
            "type": "string",
            "description": "CPU Model Code"
        },
        {
            "endpoint": "/mem/totalBytes",
            "type": "longinteger",
            "description": "Total RAM quantity (Bytes)"
        }
    ]
}

Curl request example is:

curl -X GET \
  'https://api.eu1.astarte.cloud/appengine/v1/realm_name/devices/some_device_id/interfaces/io.edgehog.devicemanager.HardwareInfo' \
  -H 'Authorization: Bearer YOUR_BEARER_TOKEN'

Response is(some data is missing but it should be enough to finish the task):

{"data":{"cpu":{"architecture":"aarch64"},"mem":{"totalBytes":2076966912}}}