Add full support for Velero customized install

[dymurray]

https://velero.io/docs/v1.4/customize-installation/

• Enable custom plugins
• Install in any namespace
• Support installation with non-file-based identity mechanisms #175
• Enable Restic integration
• Enable Features (CSI)
• Customize resource requests + limits
• Configure more than one storage location for backup/volumes (minimum 1 per provider ideally N per provider)
• Do not configure BSL during install (optional)
• Use storage provider with self-signed certificate
• Add restore resource priorities configuration option #176

0.3.0 Regression

• Customize install: Do not configure BSL during install #379

[yipng]

Can the restore-resource-priorities velero server option be included as part of this customization as well?

[kaovilai]

0.3.0 release regression from 0.2
Regressed feature

• Do not configure BSL during install (optional)