feat: schema v3 iteration

[43081j]

This is a first attempt at the new version of the schema.

The major change here is that we'd go from having an array of many
replacements, to one entry per source module with many replacements.

For example:

{
  "type": "module",
  "moduleName": "chalk",
  "replacements": [
    {
      "type": "native",
      "engines": [
        { "engine": "node", "minVersion": "X.Y.Z" }
      ],
      "url": { "type": "node", "id": "styleText" },
      "description": "The `styleText` built-in provides [...]"
    }
  ]
}

[43081j]

i now added sync scripts to use runtime compat data, and web feature data

so we have this engines populated from the web features data:

        {
          "type": "native",
          "webFeatureId": "fetch",
          "engines": [
            {
              "engine": "chrome",
              "minVersion": "42"
            },
            {
              "engine": "chrome_android",
              "minVersion": "42"
            },
            {
              "engine": "edge",
              "minVersion": "14"
            },
            {
              "engine": "firefox",
              "minVersion": "39"
            },
            {
              "engine": "firefox_android",
              "minVersion": "39"
            },
            {
              "engine": "safari",
              "minVersion": "10.1"
            },
            {
              "engine": "safari_ios",
              "minVersion": "10.3"
            }
          ],
          "url": {
            "type": "mdn",
            "id": "Web/API/Fetch_API"
          },
          "description": "Use native fetch"
        },

and this from the runtime data:

        {
          "type": "native",
          "nodeFeatureId": {
            "moduleName": "node:buffer",
            "exportName": "Buffer"
          },
          "engines": [
            {
              "engine": "cloudflare",
              "minVersion": "24.9.0"
            },
            {
              "engine": "deno",
              "minVersion": "24.9.0"
            },
            {
              "engine": "vercel",
              "minVersion": "24.9.0"
            },
            {
              "engine": "netlify",
              "minVersion": "24.9.0"
            }
          ],
          "url": {
            "type": "e18e",
            "id": "buf-compare"
          },
          "description": "Use native Buffer.compare"
        }

[43081j]

so i dont forget:

• we should have two top-level collections
  • one is the replacements (mappings of module to its replacements)
  • one is the targets (things we replace those modules with, i.e. what we mapped to)
• a replacement mapping's modules are just a set of IDs we later lookup from the targets list
• we need some representation of which replacements are "preferred"