🔧 additional VPC flow log fields required for Cortex XSIAM

[kyphutruong]

This PR adds additional fields to the VPC flow logs records.

Currently the flow logs are set have the default log_format with the following fields:

${version} ${account-id} ${interface-id} ${srcaddr} ${dstaddr} ${srcport} ${dstport} ${protocol} ${packets} ${bytes} ${start} ${end} ${action} ${log-status}

This PR will set a custom log_format, which essentially is just appending additional fields to the flow logs and will now have the following fields:

${version} ${account-id} ${interface-id} ${srcaddr} ${dstaddr} ${srcport} ${dstport} ${protocol} ${packets} ${bytes} ${start} ${end} ${action} ${log-status} ${az-id} ${flow-direction} ${instance-id} ${pkt-srcaddr} ${pkt-dstaddr} ${region} ${sublocation-id} ${sublocation-type} ${subnet-id} ${tcp-flags} ${ype} ${vpc-id}

The requirement for this is explained in issue XSIAM: VPC Flow log custom filters