feat: added the ability to pass json content not only as a file with the json extension

[ya-makariy]

Explanation

Added the ability to pass json content not only as a file with the json extension.
Usage Example:

kyverno-json  scan --policy catalog/dockerfile/dockerfile-deny-latest-image.yaml --payload <(dockerfile-json /path/to/Dockerfile)

Related issue

Milestone of this PR

What type of PR is this

Proposed Changes

Proof Manifests

Checklist

• I have read the contributing guidelines.
• I have read the PR documentation guide and followed the process including adding proof manifests to this PR.
• This is a bug fix and I have added unit tests that prove my fix is effective.
• This is a feature and I have added CLI tests that are applicable.
• My PR needs to be cherry picked to a specific release branch which is .

Further Comments

[ya-makariy]

Hi, @eddycharly. Any updates on this PR?