Add HBRequest.collateBody

[adam-fowler]

Used to collate request body before it reaches the request handler eg in middleware

struct MyMiddleware: HBMiddleware {
    func apply(to request: HBRequest, next: HBResponder) -> EventLoopFuture<HBResponse> {
        return request.collateBody().flatMap { request in
            request.logger.info("Buffer size: \(request.body.buffer!.readableBytes)")
            // note must pass on new request to next responder otherwise the body will be lost
            return next.respond(to: request)
        }
    }
}

[codecov]

Codecov Report

Base: 78.97% // Head: 79.01% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (07cad65) compared to base (954e808).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 07cad65 differs from pull request most recent head adb9198. Consider uploading reports for the commit adb9198 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
+ Coverage   78.97%   79.01%   +0.03%     
==========================================
  Files          74       74              
  Lines        3187     3192       +5     
==========================================
+ Hits         2517     2522       +5     
  Misses        670      670              

Impacted Files	Coverage Δ
Sources/Hummingbird/Server/Request.swift	93.54% <100.00%> (+0.56%)	⬆️

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