This commit represents a few experiments of features I've used in Cobra
1. Uses cli.GenericFlag to encapsulate parsing and validation of flag
values at parse time. This removes the burden from the individual
CLI commands to parse and validate args and options.
2. Add influxid.ID that may be used by any flag that requires an
Influx ID. influxid.ID parses and validates string value is a valid
ID, removing this burden from individual commands and ensuring valid
values before the command actions begins.
3. Binds cli.Flags directly to params structures to directly capture
the values when parsing flags.
4. Moves from global state to local builder functions for the majority
of the commands. This allows the commands to bind to flag variables
reducing the repeated ctx.String(), ctx.Int(), etc
5. Leverages the BeforeFunc to create middleware and inject the CLI and
API client into commands, saving the repeated boilerplate across
all of the instantiated commands. This is extensible, so additional
middleware can be appends using the middleware.WithBeforeFns
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