Metametrics

[danjm]

This PR implements the analytics system described here https://medium.com/metamask/metametrics-an-introduction-to-metamasks-new-analytics-system-e9749e74a275

Code related to the sending of metrics can be reviewed. Reviewers may find it easy to review commit by commit.

Outstanding UI tasks include:

• Add correct chart graphic on opt-in screen
• Update the opt-in modal (for existing users) to latest designs
• Apply the responsive design to the opt-in modal
• Make other first time flow changes on which this will depend
• Rebase this onto first time flow changes
• Update tests

[danjm]

Now with responsive designs

[danjm]

Will rebase onto #6192 once merged

[danjm]

I think opting IN to metrics is being recorded as opting out

Good catch again. Fixed now.

[metamaskbot]

Builds ready [2dbc223]: mascara, chrome, firefox, edge, opera

[metamaskbot]

Builds ready [53356fd]: mascara, chrome, firefox, edge, opera