Add telemetry to CLI

[Wauplin]

Using the existing send_telemetry utility, which is anonymous and thread-safe.

If HF_HUB_OFFLINE=1 or HF_HUB_DISABLE_TELEMETRY=1 is set as environment variable, the telemetry is disabled.

Currently this is an opt-out option (as for other telemetry used in sub-libraries). Collected data doesn't contain any personal information (no user token, no local path, etc.). The only information is the command that has been typed without any options or arguments, e.g:

• hf auth list => collects "hf/auth/list"
• hf download openai-community/gpt2 => collects "hf/download"

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[Wauplin]

after some internal discussions, preferable to just drop it for now