Replace hardcoded test tags with metadata provided by cluster

[denis-maiorov-brightsec]

The CLI uses hardcoded enum with test tags to show run:scan command help and assign default tests when no options are provided. It's now required to add new tag to the enum and bump version for clients to be able run a scan with a new test: see #492, #482, etc.

Public API now exposes auth free endpoints that provide metadata about tests including tags: https://app.brightsec.com/api/v1/docs/#/Scan%20Tests

In order to keep all the behavior async command builder has to be implemented. It requires to bump yargs to v17.