feat(standards): add dpub-roles spec

[straker]

I generating the list automatically using a custom script on the 1.0 spec page. I then created a script to diff the generated file against our current lookup table and modified the output as needed to match (putting comments where and why changes were made).

The final output of the diff contains things I believe we are OK with but am putting here for reference. They are mostly additional aria allowed attrs that the current lookup table did not have but the spec allows. Seems we missed 2 name from content roles and a single allowed attr.

====== doc-glossref.nameFromContent ======
* doc-glossref.nameFromContent does not exist in the lookupTable
{ AssertionError [ERR_ASSERTION]: doc-glossref.nameFromContent does not match
    at file:///Users/stevenlambert/deque/axe-core/diff.mjs:49:14
    at ModuleJob.run (internal/modules/esm/module_job.js:95:12)
  generatedMessage: false,
  name: 'AssertionError [ERR_ASSERTION]',
  code: 'ERR_ASSERTION',
  actual: true,
  expected: undefined,
  operator: 'deepEqual' }


====== doc-noteref.nameFromContent ======
* doc-noteref.nameFromContent does not exist in the lookupTable
{ AssertionError [ERR_ASSERTION]: doc-noteref.nameFromContent does not match
    at file:///Users/stevenlambert/deque/axe-core/diff.mjs:49:14
    at ModuleJob.run (internal/modules/esm/module_job.js:95:12)
  generatedMessage: false,
  name: 'AssertionError [ERR_ASSERTION]',
  code: 'ERR_ASSERTION',
  actual: true,
  expected: undefined,
  operator: 'deepEqual' }


====== doc-pagebreak.allowedAttrs ======
{ AssertionError [ERR_ASSERTION]: doc-pagebreak.allowedAttrs does not match
    at file:///Users/stevenlambert/deque/axe-core/diff.mjs:49:14
    at ModuleJob.run (internal/modules/esm/module_job.js:95:12)
  generatedMessage: false,
  name: 'AssertionError [ERR_ASSERTION]',
  code: 'ERR_ASSERTION',
  actual: [ 'aria-expanded', 'aria-orientation' ],
  expected: [ 'aria-expanded' ],
  operator: 'deepEqual' }

Part of issues: #2108, #2303, and #2243

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[stephenmathieson]

Why is this .mjs?

[WilcoFiers]

Why is this a ".mjs" file?

[straker]

Ha. I didn't know how to load it as a js file using imports in my node script so had them as .mjs extensions so it would work. Forgot to name it back.

Resoled

[stephenmathieson]

File extension LGTM 😆

Please have someone else who has been following this "standards" work more closely review the rest of this PR tho.