feat: adds support for package.json merging

[jbottigliero]

This will, in theory, will add support for downstream codebases to include arbitrary dependencies and devDependencies into a generator context. Using this functionality, in combination with content or overrides means you can easily include package-based code in custom content.

The below example shows how this would look to downstream codebases – the key thing to note is that this appears no different than installing and using a dependency as you would in any project using NPM.

content/
 index.mdx
static.json
package.json

// static.json
{
  "_static": {
    "generator": {
      "name": "@globus/static-search-portal"
    }
  },
  "data": {
    "version": "1.0.0",
    "attributes": { /* ... */ } 
   }
}

// package.json
{
    "dependencies": {
        "@globus/static-search-portal": "1.5.0",
        "d3": "^7.9.0"
    }
}

// content/index.mdx
import * as d3 from 'd3';

# Welcome!

{{(function(){ console.log(d3);}()}}