archive/tar: add FileInfoNames interface

[qiulaidongfeng]

An optional interface FileInfoNames has been added.

If the parameter fi of FileInfoHeader implements the interface
the Gname and Uname of the return value Header are
provided by the method of the interface.

Also added testing.

Fixes #50102

Change-Id: I6fd06c7c9aaf29b22b7384542fe57affed33009a

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Patch Set 2:

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Patch Set 4:

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Patch Set 4:

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Patch Set 5:

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Patch Set 5:

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Patch Set 6:

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Message from Ian Lance Taylor:

Patch Set 6: Run-TryBot+1

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Patch Set 6: TryBot-Result+1

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Patch Set 6: Auto-Submit+1 Code-Review+2 Run-TryBot+1

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This PR is being closed because golang.org/cl/514235 has been merged.