add support for multiple categories

[viveksahu26]

fixes #301

The PR adds support for multiple categories. For example, user want to see score for 3 categories NTIA-minimum-elements,Semantic,Sharing. See below the command and o/p:

go run main.go score --category NTIA-minimum-elements,Semantic,Sharing   samples/sbomqs-spdx-syft.json  
catScores()
SBOM Quality by Interlynk Score:6.4     components:27   samples/sbomqs-spdx-syft.json
+-----------------------+-------------------------+-----------+--------------------------------+
|       CATEGORY        |         FEATURE         |   SCORE   |              DESC              |
+-----------------------+-------------------------+-----------+--------------------------------+
| NTIA-minimum-elements | comp_with_name          | 10.0/10.0 | 27/27 have names               |
+                       +-------------------------+-----------+--------------------------------+
|                       | comp_with_supplier      | 0.0/10.0  | 0/27 have supplier names       |
+                       +-------------------------+-----------+--------------------------------+
|                       | comp_with_uniq_ids      | 10.0/10.0 | 27/27 have unique ID's         |
+                       +-------------------------+-----------+--------------------------------+
|                       | comp_with_version       | 10.0/10.0 | 27/27 have versions            |
+                       +-------------------------+-----------+--------------------------------+
|                       | sbom_authors            | 10.0/10.0 | doc has 2 authors              |
+                       +-------------------------+-----------+--------------------------------+
|                       | sbom_creation_timestamp | 10.0/10.0 | doc has creation timestamp     |
|                       |                         |           | 2023-05-04T09:33:40Z           |
+                       +-------------------------+-----------+--------------------------------+
|                       | sbom_dependencies       | 10.0/10.0 | doc has 1 relationships        |
+-----------------------+-------------------------+-----------+--------------------------------+
| Semantic              | comp_with_checksums     | 0.0/10.0  | 0/27 have checksums            |
+                       +-------------------------+-----------+--------------------------------+
|                       | comp_with_licenses      | 0.0/10.0  | 0/27 have licenses             |
+                       +-------------------------+-----------+--------------------------------+
|                       | sbom_required_fields    | 10.0/10.0 | Doc Fields:true Pkg            |
|                       |                         |           | Fields:true                    |
+-----------------------+-------------------------+-----------+--------------------------------+
| Sharing               | sbom_sharable           | 0.0/10.0  | doc has a sharable license     |
|                       |                         |           | free 0 :: of 1                 |
+-----------------------+-------------------------+-----------+--------------------------------+