Adds generic ring #108

Adds a generic implementation of the stdblib ring buffer so that each ring `Value` can be a concrete type. https://pkg.go.dev/container/ring Adds `Len() int` and `Keys() []K` func to the generic Map cmap. Changes `events/queue` Processor `Queueable` to be an exported type. No functional change, but consumed types should be exported. Signed-off-by: joshvanl <[email protected]>