net/http: make the http server con write buffer size configurable

[oddmario]

This change adds a configurable WriteBufferSize option to the Go HTTP server to be used (if set) instead of the hard coded 4 KB

Fixes #68149

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Patch Set 1:

(1 comment)

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Message from Ian Lance Taylor:

Patch Set 1: Hold+1

(1 comment)

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Message from Mario Fathy:

Patch Set 1:

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Message from Ian Lance Taylor:

Patch Set 1:

(1 comment)

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Message from Damien Neil:

Patch Set 2:

(1 comment)

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[neild]

Sorry, I managed to copy a repo name from the wrong window and accidentally overwrote the PR briefly. I believe I've put things back the way they were. Again, sorry!