allow server input to middleware

[dezren39]

this allows to share the middleware.

something like

promSrv := promwish.NewServer("localhost:8080")

s, err := wish.NewServer(
  wish.WithMiddleware(
    promwish.MiddlewarewithServer(promSrv, "my-app")
  )
)

promSrv.Shutdown(context.Background())

i will try to test later but this is untested atm.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (server@2c341cc). Click here to learn what that means.

Files	Patch %	Lines
main.go	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             server      #39   +/-   ##
=========================================
  Coverage          ?   76.00%           
=========================================
  Files             ?        1           
  Lines             ?       75           
  Branches          ?        0           
=========================================
  Hits              ?       57           
  Misses            ?       15           
  Partials          ?        3           

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