feat(rollup-plugin-html): extractAssets from custom tagName

[gdbaldw]

Optional array of tagName and attribute objects, useful for extracting assets from custom tags

What I did

-1. Fixed latent issues with existing demos, and added a line to Developer Doc

0. Created new test case: src/input/extract/extractAssetsByTagAndAttributes.test.ts
1. Created a new interface for TagAndAttribute
2. Enhanced extractAssets interface to: boolean | TagAndAttribute[]
3. Injected extractAssets into the relevant asset/utils.ts functions
4. All relevant function signatures optionally include params.extractAssets
5. Passed all tests
6. Updated demo/spa to demonstrate TagAndAttribute[]
7. Linted and Formatted
8. Updated documentation to show how to use this new feature
9. Added demo/disable to demonstrate that extractAssets: false still works correctly
10. Added support for recursive templates, then re-test, re-lint, and re-format.

Example usage

const html = require('../../dist/index').default;

module.exports = {
  input: 'demo/spa/index.html',
  output: {
    dir: './demo/dist',
  },
  plugins: [html({
    absoluteBaseUrl: 'http://localhost:8000',
    extractAssets: [
      {tagName: 'my-first-el', attribute: 'my-src'},
      {tagName: 'my-second-el', attribute: 'my-src'},
    ]
  })],
};

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Latest commit: 7201bf70c2a87131c2e3bc8e6b1bd6a36fbdfbd6

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