[float8] Allow specifying arbitrary dtype for each tensor

[lw]

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• -> #1326

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As of commit b9672f55eedf0ad65d55289690ee9ade4381fe7f with merge base 06ad55acb0d034a4e98e82a9eeddbd41d4d94b31 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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