Generate JSON output

[ChrisR2487]

Desired Outcome

Add a CLI flag e.g. --json, --output=json, etc that allows for machine readable, JSON formatted output for the report result, rather than richly formatted text.

Implemented Changes

Describe how the desired outcome above has been achieved with this PR. In particular, consider:

• What's changed? Why were these changes made?
  • Used JSON package to generate an indented JSON report of all preflight checks.
  • Created a new flag for the root command using Cobra library to enable JSON output

Here is an example of what part of the JSON output looks like:

{
 "version": "",
 "sections": [
  {
   "title": "CPU",
   "results": [
    {
     "title": "CPU Cores",
     "value": "8",
     "status": "INFO",
     "message": ""
    },
    {
     "title": "CPU Architecture",
     "value": "amd64",
     "status": "INFO",
     "message": ""
    }
   ]
  }, ...

Connected Issue/Story

CyberArk internal issue ID: ONYX-29737

Definition of Done

At least 1 todo must be completed in the sections below for the PR to be merged.

Changelog

• [x] The CHANGELOG has been updated, or
• [ ] This PR does not include user-facing changes and doesn't require a CHANGELOG update

Test coverage

• [ ] This PR includes new unit and integration tests to go with the code changes, or
• [x] The changes in this PR do not require tests

Documentation

• [ ] Docs (e.g. READMEs) were updated in this PR
• [ ] A follow-up issue to update official docs has been filed here: [insert issue ID]
• [x] This PR does not require updating any documentation

Behavior

• [ ] This PR changes product behavior and has been reviewed by a PO, or
• [ ] These changes are part of a larger initiative that will be reviewed later, or
• [x] No behavior was changed with this PR

Security

• [ ] Security architect has reviewed the changes in this PR,
• [ ] These changes are part of a larger initiative with a separate security review, or
• [x] There are no security aspects to these changes