Send severity data along with vulnerability in bulk api

[sbs2001]

Fix #351
Signed-off-by: Shivam Sandbhor [email protected]

[pombredanne]

Thanks!
See the proposed changes below for your consideration.

[sbs2001]

For the POST request to /api/packages/bulk_search with the body as

{
            "purls": [
                "pkg:deb/debian/[email protected]?distro=jessie",
                "pkg:maven/com.datadoghq/[email protected]",
            ]
        }

The response looks like :

[
            {
                "name": "doesnotexist",
                "namespace": "debian",
                "qualifiers": {"distro": "jessie"},
                "resolved_vulnerabilities": [],
                "subpath": None,
                "type": "deb",
                "unresolved_vulnerabilities": [],
                "version": "0.9.7-10",
            },
            {
                "name": "datadog-api-client",
                "namespace": "com.datadoghq",
                "purl": "pkg:maven/com.datadoghq/[email protected]",
                "qualifiers": {},
                "resolved_vulnerabilities": [],
                "subpath": "",
                "type": "maven",
                "version": "1.0.0-beta.7",
                "url": "http://testserver/api/packages/3467",
                "unresolved_vulnerabilities": [
                    {
                        "references": [
                            {
                                "reference_id": "",
                                "scores": [],
                                "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21331",
                            },
                            {
                                "reference_id": "GHSA-2cxf-6567-7pp6",
                                "scores": [{"scoring_system": "cvssv3.1_qr", "value": "LOW"}],
                                "url": "https://github.com/DataDog/datadog-api-client-java/security/advisories/GHSA-2cxf-6567-7pp6",
                            },
                            {
                                "reference_id": "GHSA-2cxf-6567-7pp6",
                                "scores": [],
                                "url": "https://github.com/advisories/GHSA-2cxf-6567-7pp6",
                            },
                        ],
                        "url": "http://testserver/api/vulnerabilities/60",
                        "vulnerability_id": "CVE-2021-21331",
                    }
                ],

            },
        ]

[pombredanne]

@sbs2001 can we add the comment above to the doc?

[sbs2001]

@pombredanne that's already done via d8ce30e