feat: Add visual regression testing tool.

[steveworley]

What's changed?

• Adds a new qc vrt command to perform visual regression testing

One of the primary use cases for Quant is a DR environment tool, it creates static representations of production websites and then can act as an origin failover in the event of origin downtime. To ensure that Quant is fresh, this command can be used to validate a quant domain against a production domain.

npm run start -- vrt

> @quantcdn/quant-cloud-cli@0.3.0 start
> node dist/index.js vrt

█ QUANT CLI
[VRT] Running VRT for 1 project(s)...
[VRT] Threshold: 10.00%, Max Pages: 1, Max Depth: 1
[VRT] 
Testing project: test-dr
✔ Quant URL: 861176.quant-cloud.quantgovsites.com                                                                                                                
[VRT] Remote URL: https://www.test.com.au
✔ Found 1 pages to test                                                                                                                                         
✖ / FAIL (36.29%)                                                                                                                                               
[VRT] 
=== VRT Summary ===
[VRT] Total Tests: 1
[VRT] Passed: 0
[VRT] Failed: 1
[VRT] Errors: 0
[VRT] 
Results by Project:
[VRT] 
test-dr:
[VRT]   ✓ 0 passed
[VRT]   ✗ 1 failed

Supports command line attributes for single runs and configuration files for extended runs.

$ cat ~/.vrt-config.json
{
    "threshold": 0.1,
    "maxPages": 1,
    "maxDepth": 1,
    "quantAuth": "test:test",
    "projects": {
        "test-dr": "https://www.test.com.au"
    }
}