Feature/event tracking command count on mixpanel

[sukantoraymond]

Closes #579

Description

Tracks command count through mixpanel. Events are tracked with name of format {mainCommand}-{subCommand}

e.g. accounts-get

---

For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[devbugging]

We need to implement an option to disable tracking in an opt-out fashion. MIxpanel allows setting such a property as seen here https://developer.mixpanel.com/docs/javascript#opting-users-out-of-tracking.
There needs to be a command and a way to disable tracking. I suggest adding a command to config: flow config disable metrics which then disables any tracking. We also need to add to documentation what we are tracking and how to disable it, I suggest creating a doc page titled "Data Collection" where it's explained that we only track command data and also the Crash report data we track if user agrees. It needs to be stated that no personal information is ever collected and the all data is anonymized. I think we should ping legal as well.

[sukantoraymond]

The closest thing that I find with regards to the opt out on javascript sdk, is to use user properties as stated in https://developer.mixpanel.com/reference/profile-set. This means that we will start referencing each user to an ID, but since we are not linking their distinct id with the events (in this case the commands), we will not be able to see the commands that they call (which is what we want).

Another option if we want to minimize tracking each user is to implement opt in option either in a new json (like settings.json) or implement a new key in flow.json (sth like tracking_enabled: true/false), so that we can have the option locally everytime. Thoughts on which way we should go?

[devbugging]

Left small coments, LGTM