Implement PyScript custom <script type> (#1548)

* updated MicroPython to latest in order to have `globals` API available
  * reduced code around helpers for both MicroPython and Pyodide as now these are more aligned
  * updated all dependencies and brought in latest [coincident/window](https://github.com/WebReflection/coincident#coincidentwindow) goodness to any `xworker`, preserving the `sync` previous behavior
  * using [@ungap/structured-clone/json](https://github.com/ungap/structured-clone#tojson) as *coincident* default `parse` and `stringify` utility to allow recursive and more complex data to travel back from the *Worker* (forward data is still fully [structured clone algorithm compatible](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm))
  * renamed all *plugin/s* references to *custom/s* as plugin as a word was too misleading
  * changed *custom types* helpers logic to allow any single node to have its own version of the interpreter wrapper, and all the extra fields it carries with it, including a way to augment every interpreter execution, among as every worker code execution
  * created a `custom` folder where I've landed the very first `pyscript.js` custom type
  * created an exhaustive test page to demonstrate the current abilities of *PyScript Next* among its ability to expose utilities that can be used to create *PyScript* plugins

pyscript.core/rollup/pyscript.config.js

@@ -0,0 +1,18 @@
+// This file generates /core.js minified version of the module, which is
+// the default exported as npm entry.
+
+import { nodeResolve } from "@rollup/plugin-node-resolve";
+import terser from "@rollup/plugin-terser";
+
+import { createRequire } from "node:module";
+
+createRequire(import.meta.url)("./build_xworker.cjs");
+
+export default {
+    input: "./esm/custom/pyscript.js",
+    plugins: process.env.NO_MIN ? [nodeResolve()] : [nodeResolve(), terser()],
+    output: {
+        esModule: true,
+        file: "./pyscript.js",
+    },
+};