Create a routine triage strategy

This is an action item of the COE on hyper's surprise CVE. We have a pile of issues and pull requests that don't get regularly reviewed, and new issues that take a while to get some eyes. It would be beneficial to setup some strategy to do. We can make a more welcoming experience, promptly fix problems, identify more serious issues, and mentor new contributors.

The resolution of this issue should be a pull request adding to the docs/ folder in this repo, outlining what the triage strategy is.

Note: anyone is encouraged to sign up a triager, to help us out.

Some questions to consider:

• How often should "routine" be?
• Should it be done synchronously?
• How do we keep ourselves accountable to doing it?
• How do we keep track of what has been triaged, and what next actions are for any issue or pull request?

Some possible options include:

• Synchronous text meeting, such as in a Discord channel.
• Synchronous video meeting.
• Partial video, such as streaming a screen (like on Twitch or Discord), and others in text chat.
• Async, having a few people do it at a convenient time for them during the week, and send a report somewhere (Discord?)

For keeping track, we could create a T- sets of labels, like T-needs-mvce, T-waiting-on-author, etc. We can come up with a specified amount of time for something to be sitting in a certain "triage" state, before moving to another, or being closed.

Triage process

These are just proposed things to do, so far:

• Make sure new issues have all the needed info from the reporter. This would benefit from a checklist (https://github.com/hyperium/hyper/issues/3215).
• Check if any issues waiting on author have received comments from them.
• Consider tagging a collaborator (or a volunteer to mentor) that can fix it, or review if a PR.

Review the existing docs/ folder and the triager guidance in docs/MAINTAINERS.md, then use the listed questions and proposed process as the requirements to resolve. Done means a pull request adds a document under docs/ that clearly outlines the routine triage strategy.