SC-SAST: Provide ability to pass custom targs/sargs when starting scan

[kadraman]

We have many customers that pass custom targs/sargs when starting ScanCentral scans remotely, including:

• filter files (-filter)
• custom rules (-rules)
• scan precision (-scan-precision)/ scan policy (-scan-policy)

We need to update sc-sast start scan command with additional for sargs and targs. Although the scancentral package command accepts a targs options it doesn't appear to accept an sargs option and in case, from the documentation:

Deprecated: Fortify recommends that you use the ‑sargs option directly with the Start Command.

So we should add these options to our start command.

[rsenden]

Duplicate of #198, but keeping this one as it contains slightly more information.