Feature: Introduce diff Command for Version Comparison

[houdini91]

This PR introduces a new diff command to demonstrate the functionality of the NodeList API.

Note: PR uses the protobom Suggested Diff API - https://github.com/bom-squad/protobom/pull/173

For example, executing go run main.go diff syft.alpine.3.18.6.cdx.json syft.alpine.3.19.1.cdx.json will generate a comparison between two versions of a Syft Alpine image. The output will present the version drift of packages, showing which packages have been added, removed, or changed between the two versions.

Here's a sample output:

+--------------+---------+-------------+-------------+
| PACKAGE NAME | ACTION  | OLD VERSION | NEW VERSION |
+--------------+---------+-------------+-------------+
| alpine       | changed | 3.18.6      | 3.19.1      |
+--------------+---------+-------------+-------------+
ROOT ELEMENTS

+------------------------+---------+-------------+----------------------+
|      PACKAGE NAME      | ACTION  | OLD VERSION |     NEW VERSION      |
+------------------------+---------+-------------+----------------------+
| alpine                 | changed | 3.18.6      | 3.19.1               |
| alpine                 | changed | 3.18.6      | 3.19.1               |
| alpine-baselayout      | changed | 3.4.3-r1    | 3.4.3-r2             |
| alpine-baselayout-data | changed | 3.4.3-r1    | 3.4.3-r2             |
| apk-tools              | changed | 2.14.0-r2   | 2.14.0-r5            |
| busybox                | changed | 1.36.1-r5   | 1.36.1-r15           |
| busybox-binsh          | changed | 1.36.1-r5   | 1.36.1-r15           |
| musl                   | changed | 1.2.4-r2    | 1.2.4_git20230717-r4 |
| musl-utils             | changed | 1.2.4-r2    | 1.2.4_git20230717-r4 |
| scanelf                | changed | 1.3.7-r1    | 1.3.7-r2             |
| ssl_client             | changed | 1.36.1-r5   | 1.36.1-r15           |
| zlib                   | changed | 1.2.13-r1   | 1.3.1-r0             |
+------------------------+---------+-------------+----------------------+

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