[Feature Request] multi --severity-level option

[aman-mehta-sf]

Is your feature request related to an issue that you encountered with Salesforce Code Analyzer?
Yes.

Describe the solution that you want:
If I have two engines, I can only specify the severity level once for all engines. It would be helpful to have a more granular on specifying severity levels for each engine:

Current situation:
sf scanner:run --format 'json' --engine 'eslint,pmd' --outfile 'build/reports/codeanalyzer.json' --severity-threshold '3' --target ./test/resources/force-app/

Ideally something like this:

sf scanner:run --format 'json' --engine 'eslint,pmd' --outfile 'build/reports/codeanalyzer.json' --severity-threshold '[3,2]' --target ./test/resources/force-app/

Notice that eslint has severity level 3, while pmd has severity level 2.

Describe alternatives that you've considered:
N/A

Additional Context:
N/A

Workaround:
I just run the commands individually for now.

Urgency:
Nice to have

[git2gus]

This issue has been linked to a new work item: W-14845936