feat(misconf): Selectively enable misconfiguration scanners

[simar7]

Today we don't have a good way to specify only certain misconfiguration scanners to be run and certain to be disabled. For instance with a file directory input like so:

$ ls
Dockerfile
chart.yaml
main.tf

trivy config will scan all of the files. We can limit to an extent by providing file extensions, paths and/or globbing to exclude/include certain types but the approach seems rather convoluted.

Therefore, having a flag to enable selective scanners only (similar to -vuln-type) in config scan will help. I propose that we can pick --config-type as the flag name and provide values such as: dockerfile, helm, terraform.

The use case will look like the following:
trivy config --config-type=dockerfile,helm

Will only scan dockerfile and helm.

[mogopz]

This would be great to have. We're blocked from migrating away from tfsec until this is possible.