Stabilize DB `search` output

[wagoodman]

With DB v6 there will be substantial changes made to the DB structure. We'd like to have a way for users to have a common interface with stable output (not directly tied to the DB schema/shapes) across grype versions.

The search command should be expanded to:

• Query a single CVE to get the NVD record (always one)
• Query a single vulnerability ID to get the vulnerability record(s)

Are there more use cases we should capture?

This output should be available in:

• table output
• json output

All json output should have a JSON schema describing valid/expected shapes/values.

[TimBrown1611]

please notice to this kind of issue in grype db search - https://github.com/anchore/grype/issues/2085 (can be solved in the same task)

[wagoodman]

https://github.com/anchore/grype/pull/2288/files#diff-dcf61b30ec74dd958726ebbb9a3ff0b0b271839989f03d8f0d233de89381a727R84-R85 We have the search command partially updated to use the new curator, but does not do anything with the store results until there is something that inflates the vulnerability.Vulnerability struct from the DB models.