Manage ESP32 OTA (#133)

Match thing VariableName with dashboard variable_id (#128)

When a dashboard is extracted the `variable_id` fields are filled with property `VariableName`. However when they're imported to create a dashboard the field `name` is used instead.

* Match thing variable_name with dashboard variable_id

* Fix dashboard with variable tests

Update cloud links in README (#123)

Export config package (#113)

Move 'config' from internal package. It should not be an internal package because it's needed by external modules to use the command package.

Last updates

major improvements:

- introduction of generic device (device create-generic)
- add command to retrieve list of fqbn supported by iot cloud (device list-fqbn)
- binaries have been decoupled from the repo. they're downloaded during device provisioning
- binaries are generated and uploaded by CI action whenever a change is made on provisioning sketches
Config improvements:
- 'config init' command prompts the user to insert client-id and client-secret
- config is searched in cwd, its parents and then in arduino15 dir to allow a global config file
- use arduino15 directory by default for 'config init'
- fetch config parameters from environment variables (using ARDUINO_CLOUD prefix)

Major improvements

- tags creation/deletion implemented on thing and device
- add possibility to delete/list things/devices using tags
- show tags in thing/device list commands
- ota mass-upload introduced
- implemented provisioning on lora devices
- serial wait time increased
- various minor fixes

increment wait time and serial timeout

cli in beta

dev - fix ota deferred