Move AGLint comment parser into the AGLint codebase

[scripthunter7]

Currently, AGTree is able to parse AGLint comments. However, for this, AGTree requires an external library, json5, to parse configuration objects, such as this:

! aglint "rule-1": ["warn", { "option1": "value1" }], "rule-2": "off"

I suggest that, for the optimal operation of AGTree, we move this logic into AGLint, as it is only relevant there.

[scripthunter7]

Also, we can consider using levn: https://www.npmjs.com/package/levn