feat: decoupled video config

[luwes]

fix #304
related #281

This change adds a video config that is decoupled (not stored) in the Next runtime config which allows us to store complex objects like functions. It's a similar pattern that next-auth uses.

The old pattern of adding the video config to next.config.js still works for processing local assets but remote assets will require adding a next-video.(js|mjs) file with the video config. This file will export some functions that can then be used in the video API routes.

for example:

// next-video.mjs
import { NextVideo } from 'next-video/process';
import { readFile } from 'fs/promises';

export const { GET, POST, handler, withNextVideo } = NextVideo({
  loadAsset: async function (assetPath) {
    console.warn(99, assetPath);
    const file = await readFile(assetPath);
    const asset = JSON.parse(file.toString());
    return asset;
  },
});

withNextVideo is exported as well so devs don't need to duplicate the video config.

// next.config.mjs
import { withNextVideo } from './next-video.mjs';

/** @type {import('next').NextConfig} */
const nextConfig = (phase, { defaultConfig }) => {
  return {
    ...defaultConfig,
  };
};

export default withNextVideo(nextConfig);

In this file devs will be able to add auth or other access control.

// api/video/route.js
export { GET, POST } from '@/next-video';

The processing on a GET request if the file is not processed yet is removed.
This requires an explicit POST request now to
e.g. /api/video?url=https://storage.googleapis.com/muxdemofiles/mux.mp4

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Name	Status	Preview	Comments	Updated (UTC)
next-video-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 28, 2024 7:50pm

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 32 lines in your changes missing coverage. Please review.

Project coverage is 88.09%. Comparing base (a3951a3) to head (ae75ae7).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/request-handler.ts	50.90%	27 Missing ⚠️
src/setup-next-video.ts	75.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #306      +/-   ##
==========================================
- Coverage   90.67%   88.09%   -2.59%     
==========================================
  Files          30       32       +2     
  Lines        2456     2562     +106     
  Branches      350      285      -65     
==========================================
+ Hits         2227     2257      +30     
- Misses        228      304      +76     
  Partials        1        1              

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[mmcc]

Should the CLI create/write this file on init now? Docs updates?