Collect plugin and Cairo error information

[stranger80]

As owners of Starknet remix plugin we would like to collect error information for analytics and trouble shooting. The error information includes:

1. Remix plugin UI errors
2. Backend API errors
3. Cairo compilation errors

IMPORTANT: Ensure that the plugin "notices" include a mention of collecting usage stats for UX analytics.

NOTE: This feature should probably be implemented as extension to "usage metrics" (#88), ie. by ensuring that relevant log entries are recorded by backend API module. For Cairo compiler errors, it will be necessary to process/parse the compiler/Scarb outputs and distill error details information from them.
NOTE2: Make sure care is taken to not record any user IP information. We only want error stats, and must not capture information owned by the plugin users.