[flashlight-cpu] New port

[jacobkahn]

Adds a port for the flashlight CPU backend.

Note that only one of the flashlight backends (flashlight-cpu or flashlight-cuda) can be installed since the two share library bits and headers. Checks have been added to flashlight-cuda. This might be relaxed down the line/we may reorganize the structure of the flashlight backends.

cc @padentomasello, @xuqiantong, @vineelpratap, @tlikhomanenko, @avidov, @syhw, @andresy

• Which triplets are supported/not supported? Have you updated the CI baseline?

x64-linux -- same as flashlight-cuda

• Does your PR follow the maintainer guide?

Yes

[NancyLi1013]

Could you please also bump version for flashlight-cuda in vcpkg.json?

Add port-version: 1

[jacobkahn]

Bump @JackBoosY @NancyLi1013 :)

[NancyLi1013]

Have you tested these features? Can they work fine?

[jacobkahn]

@NancyLi1013 — I've tested the ports on x64-linux, and everything works.

[NancyLi1013]

LGTM now, thanks for your PR @jacobkahn.

[NancyLi1013]

/azp run

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