issue-2870: Support authenticated webhook notifications in NeuVector

[williamlin-suse]

Description

Fix neuvector/neuvector#2870

Test

cli commands example:

create system webhook --type JSON --scope local --enable --username neuvector --password wh-22 http://10.1.2.3:5600
set system webhook --type JSON --scope local --enable --username neuvector --password wh-22 http://10.1.2.3:5600
show system setting 

create system webhook --type JSON --scope fed --enable --username neuvector --password fed.test http://10.1.2.3:5600
set system webhook --type JSON --scope fed --enable fed.test http://10.1.2.3:5600
show system setting --scope fed

Additional Information

Tradeoff

Potential improvement

[williamlin-suse]

@Mergifyio backport release/v5.6

[mergify]

backport release/v5.6

⚠️ Cannot use the command backport release/v5.6

Details

⚠ The product Workflow Automation needs to be activated to enable this feature.