Allow links to pending issues for no-suspicious-comment

[JoshuaKGoldberg]

Request: add an option to no-suspicious-comment to allow comments linking to an issue tracker.

This is bad:

// TODO remove this when {work} happens
this.unsafeThingThatShouldBeRemovedSoon();

However, if we have a tracking item to resolve the TODO, it's useful to keep a link to that item in code:

// See https://github.com/my-org/my-project/123
// TODO remove this when {work} happens
this.unsafeThingThatShouldBeRemovedSoon();

It could be configured like so:

"no-suspicious-comment": [true, [
    "https://github.com/my-org/my-project/(.*)"
]],

...and if there are regexps allowed, change the rule warning string to mention the allowed formats?