feat:OS CLI output part V - add issue summary

[florindumitrascu]

• Follows CONTRIBUTING rules

What does this PR do?

Improve snyk-open-source CLI output as follows:

• Add a summary section with how many issues critical, high, medium, low / fixable issues / issues with no upgrades

Where should the reviewer start?

src/lib/formatters/remediation-based-format-issues.ts

How should this be manually tested?

Run 'snyk test' command on a local project and compare output formatting with the attached screenshot

Any background context you want to provide?

What are the relevant tickets?

TUN-269

Screenshots

Additional questions

[github-actions]

	Warnings
⚠️	Since the CLI is unifying on a standard and improved tooling, we're starting to migrate old-style imports and exports to ES6 ones. A file you've modified is using either module.exports or require(). If you can, please update them to ES6 import syntax and export syntax. Files found: test/jest/unit/lib/formatters/remediation-based-format-issues.spec.ts

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