http2

We had a typo in our code that led to this error: https://github.com/vapor/vapor/blob/main/Sources/Vapor/Routing/Parameters%2BRequire.swift#L23. It was hard to debug in part because of the vague Abort(.internalServerError). I suggest adding a reason value to the Abort, unless that would be considered a breaking change. I can submit a PR if you're interested.

Checklist

• Dependencies installed
• No typos
• Searched existing issues and docs

Issue Description

When using the RateLimiter Middleware with a rate between 0 and 1 all events will be rejected instead of applying the specified rate. E.g.: e.Use(middleware.RateLimiter(middleware.NewRateLimiterMemoryStore(0.5)))

I am not saying that it is a common use case to have

The MinSendBackupAfterMs is now set to 1 ms. Unfortunately this causes backup requests to be send when there is low load. It would be useful if we could set the minimum a little bit higher for certain endpoints.

Now, callback ThreadPoolExecutor is build-in in AsyncRuntime. User can't recognize that the callback executor is full.
We need to add a set method ,so that users can custom their own callback executor.

The current exporter doesn't support OpenMetrics format. It's fairly simple and most of this is actually handled directly by the prometheus library itself via the TextFormat class. See: https://github.com/AngerM/ag_server/blob/main/base/src/main/kotlin/dev/angerm/ag_server/http/PrometheusHandler.kt
Which I based off of https://github.com/prometheus/client_java/blob/master/simpleclient_httpserver

Currently we have a mix of:

• Out of memory error.
• Out of memory error
• out of memory error
• out of memory
• out of memory.
• out of memory [some context]

All these should be adjusted to use the same wording for consistency and it should also make the executable a little bit smaller 😄