Update of intake F5 BIG-IP

Changelog: * Add support of F5 Big-IP **APM, LTM, AFM and PSM** * Extract the **timestamp from event** if available * Extract the **name of the F5 Big-IP rule applied** if available * event.type = **info** (currently "undefined") * event.category\* = **network** (currently "Successful Request") * observer.type\*\* = **firewall** (currently "ASM") * observer.product = **ASM** (currently "undefined") **Remarks:** *The previous value of “event.category” was moved to “event.action” **The previous value of “observer.type” was moved to “observer.product” For questions or assistance, please contact our support team.