Support loading blockwise quantized fp8

[EricLBuehler]

For DeepSeek V3!

[github-actions]

Code Metrics Report

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 Language            Files        Lines         Code     Comments       Blanks
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 C Header                2           35           28            0            7
 Dockerfile              1           41           22           10            9
 JSON                   12          105          104            0            1
 Python                 67         2824         2446           72          306
 Shell                   1           57           22           18           17
 Plain Text              3         3723            0         2413         1310
 TOML                   18          623          553            2           68
 YAML                    2           21           19            2            0
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 Jupyter Notebooks       4            0            0            0            0
 |- Markdown             2           77           32           31           14
 |- Python               2          205          178            1           26
 (Total)                            282          210           32           40
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 Markdown               45         3593            0         2732          861
 |- BASH                 6          103          100            0            3
 |- JSON                 1           12           12            0            0
 |- Python               7          121          109            0           12
 |- Rust                14          474          402            0           72
 |- TOML                 2           75           63            0           12
 (Total)                           4378          686         2732          960
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 Rust                  303        97808        87705         1976         8127
 |- Markdown           146         1676           25         1527          124
 (Total)                          99484        87730         3503         8251
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 Total                 458       108830        90899         7225        10706
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