JSON -> AST for Enki Curriculum

This parser processes an Enki JSON and produces the Enki Curriculum AST.

``js
const {
contentTypes: { INSIGHT }
} = require("@enkidevs/curriculum-helpers");
const {
getParser: getMarkdownParser
} = require("@enkidevs/curriculum-parser-markdown");
const {
getCompiler: getJSONCompiler
} = require("@enkidevs/curriculum-compiler-json");
const {
getParser: getJSONParser
} = require("@enkidevs/curriculum-parser-json");

const jsonCompiler = getJSONCompiler(INSIGHT);
const mdParser = getMarkdownParser(INSIGHT);
const jsonParser = getJSONParser(INSIGHT);

// get ast from a string
const ast = mdParser.parseSync(sampleInsight)

// get json from ast
const json = jsonCompiler.compileSync(ast)

// get ast back from json (using this package)
const ast2 = jsonParser.parseSync(json)
``