VAULT-17078: Audit types refactor (#22000)

* moved types to types.go

audit/options.go

@@ -9,22 +9,6 @@ import (
 	"time"
 )
 
-// Option is how options are passed as arguments.
-type Option func(*options) error
-
-// options are used to represent configuration for a audit related nodes.
-type options struct {
-	withID           string
-	withNow          time.Time
-	withSubtype      subtype
-	withFormat       format
-	withPrefix       string
-	withRaw          bool
-	withElision      bool
-	withOmitTime     bool
-	withHMACAccessor bool
-}
-
 // getDefaultOptions returns options with their default values.
 func getDefaultOptions() options {
 	return options{