Setup 'configuration file' for Arduino Cli.

[i0n-]

Add support to set the configuration file to use when the Arduino-Clie is in use.

Config file like arduino-cli.yaml are very importan for DEVOPS setup.

Please add support of it.

FYI:
Config file documentation.

[kopp]

In my opinion, it would be sufficient, if the Readme mentions, what steps you need to run to configure arduino-cli, or in general, what to do on the CLI and what to do in the extension (UI).

[trethaller]

I understand, how are we supposed to use the arduino-cli configuration file together with the extension at the moment? I couldn't find this in the README

[LitileXueZha]

This bundled arduino-cli will load default configuration file automatically, if exists.

For example, you want to set proxy:

1. First, generate the default config: <path-to>/arduino-cli config init
2. Set proxy: <path-to>/arduino-cli config set network.proxy http://1.2.3.4:5555