net/http: add ServeFileFS, FileServerFS, NewFileTransportFS

[mauri870]

These new apis are analogous to ServeFile, FileServer and NewFileTransport respectively. The main difference is that these functions operate on an fs.FS.

Fixes #51971

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Message from Damien Neil:

Patch Set 2: Code-Review+2 Run-TryBot+1

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Patch Set 2:

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Patch Set 2:

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Message from Gopher Robot:

Patch Set 2: TryBot-Result-1

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Message from Mauri de Souza Meneguzzo:

Patch Set 3:

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Message from Damien Neil:

Patch Set 3: Code-Review+2 Run-TryBot+1

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Patch Set 3:

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Patch Set 3: TryBot-Result+1

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Message from David Chase:

Patch Set 3: Code-Review+1

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This PR is being closed because golang.org/cl/513956 has been merged.