v3.2: Add style: cookie, explain pct-encoding

[handrews]

Replaces PR #4822. Please pay close attention while reviewing, I wrote this through various bouts of illness and then split it from other smaller PRs, and I'm not entirely sure I got it all.

This adds a style: cookie to provide a non-percent-encoding option for managing cookie parameters.

It also explains the conditions under which automatic percent-encoding with style: form might work, and also links to a draft update of the cookie RFC that explains that things that look like percent-encoding should not be decoded for storage, which means that style: cookie is providing the most compliant behavior for that updated guidance.

• schema changes are included in this pull request
• schema changes are needed for this pull request but not done yet
• no schema changes are needed for this pull request

[lornajane]

Comments from the TDC call and some minor edits

[handrews]

I'll fix the remaining things soon- I think I have either accepted the suggestions or otherwise replied to all comments for now.

[handrews]

I have updated most of the things. Due to the state of my health and general exhaustion, I'd like to plead that we focus only on accuracy and not what examples or formatting might be nice to have.

@lornajane – I changed "simulating" to "simulating/extending" which might make it a bit more clear why it's not just useing? idk. For the extra level on the examples, I'd happily approve a follow-on PR doing that to all of the examples in this section (although see next point below).

@baywet – I'll follow up with you on slack, but the example request is a bit more complicated. I'll happy approve a follow-on PR from you, and answer any questions you might have while making it.

@karenetheridge – I will gladly approve a PR removing the JSON-like formatting from dataValue throughout the entire spec. It's a convention that makes sense to me, but... I'm a werid data point and if no one else finds it compelling and you find it confusing, let's toss it. But for the whole spec at once.

[lornajane]

Adding a new style seemed radical but I think it works!