FoD: Allow vulnerabilities to be retrieved for a specific application release

[kadraman]

Given an existing application release with scan results, create a command that allows vulnerability details to be retrieved.

For example:

fcli fod release vulns -Filters "severityString:Critical|High"

Note: the above uses the API filter directly, maybe we should include some default queryable options and add to the filter, e.g. [--severity Critical --severity High]

[rsenden]

Potential overlap with #85, although we may want to support both approaches.

[rsenden]

This has been implemented as fcli fod issue list.