Allow support for a LimitListener

[theodesp]

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• **I'm submitting a ... **

  • bug report
  • feature request
  • support request => Please do not submit support request here, see note at the top of this template.

• Do you want to request a feature or report a bug?
  Feature

• What is the current behavior?
  No limit of the server listener connections

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

• What is the expected behavior?
  I Propose to add a limit listener that will restrict the amount of active connections in the server

• What is the motivation / use case for changing the behavior?

• Please tell us about your environment:

• Library version: v7.3.4

• Operating System: [Darwin Kernel Version 10.2.0 | Microsoft Windows [Version 10.0.10240]]

• System Information: [Core i7-7740X 16gb Ram]

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)
  I've taken the inspiration from
  https://github.com/tylerb/graceful/blob/master/limit_listen.go

wher you can wrap the net.Listener struct to accept a limit so we have a bounded number of active connections per server.

[Dexus]

Are you able to implement it with test and coverage?

[theodesp]

I will work on this weekend

[theodesp]

I would like to also enhance the ticket scope by providing options for:

1. Limiting the Server connections in a global way
2. Limiting the Server connections from a particular client.ip, request.host or request.header.X-Header
3. Expose options from a config file
4. On connection limit, we should respond with https://httpstatuses.com/429
5. Middleware support.

[Dexus]

I like it. I'm looking forward to testing it.

[Dexus]

@theodesp any update?