Utilize new quantize_onto qtensor api

[EricLBuehler]

This will remove the necessity for the "ISQ_LOW_MEMORY" environment variable because it will enable quantization on the CPU.

[github-actions]

Code Metrics Report

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 Happy                   1          442          369            0           73
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 Markdown               19         1373            0         1027          346
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 Rust                  121        37335        33732          683         2920
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 (Total)                          38002        33745         1299         2958
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 Total                 201        40905        35625         1748         3532
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