Hash function cleanups

[flaub]

• Move hashing functions into risc0_zkp::hash
• Rename ConfigHash to HashFn
• Renamed ConfigRng to Rng

[github-actions]

Benchmark for Linux-cuda c4fa2f7

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Test	Base	PR	%
fib/100/proof	1110.0±27.72ms	797.7±8.94ms	-28.14%
fib/100/run	761.9±3.25ms	404.0±2.50ms	-46.97%
fib/200/proof	1142.7±5.62ms	807.2±4.80ms	-29.36%
fib/200/run	766.1±3.21ms	407.2±2.64ms	-46.85%

Benchmark for Linux-default c4fa2f7

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Test	Base	PR	%
fib/100/proof	2.3±0.01s	2.3±0.02s	0.00%
fib/100/run	328.9±6.83ms	325.9±5.26ms	-0.91%
fib/200/proof	2.3±0.03s	2.3±0.01s	0.00%
fib/200/run	330.4±5.54ms	330.0±4.27ms	-0.12%

Benchmark for macOS-default c4fa2f7

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Test	Base	PR	%
fib/100/proof	1598.4±6.41ms	1595.7±10.08ms	-0.17%
fib/100/run	110.2±0.59ms	110.1±0.75ms	-0.09%
fib/200/proof	1599.9±12.38ms	1598.4±6.89ms	-0.09%
fib/200/run	112.3±0.62ms	112.3±1.30ms	0.00%

Benchmark for macOS-metal c4fa2f7

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Test	Base	PR	%
fib/100/proof	467.1±6.49ms	457.5±5.18ms	-2.06%
fib/100/run	113.7±0.36ms	112.1±0.72ms	-1.41%
fib/200/proof	466.4±4.33ms	465.3±8.00ms	-0.24%
fib/200/run	115.3±0.29ms	113.9±0.49ms	-1.21%

[tzerrell]

The API adjustments seem reasonable to me.

I can let people more involved in the implementation speak up in their reviews if they have any concerns with how the implementations were moved / adjusted.

[github-actions]

Benchmark for Linux-cuda 5e2b3c6

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Test	Base	PR	%
fib/100/proof	737.9±22.78ms	727.4±19.88ms	-1.42%
fib/100/run	331.4±11.36ms	314.6±8.65ms	-5.07%
fib/200/proof	758.1±49.35ms	736.0±17.89ms	-2.92%
fib/200/run	332.0±14.07ms	319.8±12.13ms	-3.67%

Benchmark for Linux-default 5e2b3c6

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Test	Base	PR	%
fib/100/proof	2.3±0.03s	2.3±0.02s	0.00%
fib/100/run	333.8±15.13ms	320.2±1.03ms	-4.07%
fib/200/proof	2.3±0.01s	2.3±0.03s	0.00%
fib/200/run	339.5±5.12ms	324.0±7.16ms	-4.57%

Benchmark for macOS-default 5e2b3c6

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Test	Base	PR	%
fib/100/proof	1599.5±14.19ms	1598.6±8.43ms	-0.06%
fib/100/run	110.5±0.63ms	109.9±0.51ms	-0.54%
fib/200/proof	1601.8±15.74ms	1601.0±9.17ms	-0.05%
fib/200/run	112.6±0.53ms	111.7±0.52ms	-0.80%

Benchmark for macOS-metal 5e2b3c6

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Test	Base	PR	%
fib/100/proof	465.5±6.30ms	459.9±5.87ms	-1.20%
fib/100/run	112.4±0.48ms	111.2±0.50ms	-1.07%
fib/200/proof	468.2±6.40ms	459.5±5.23ms	-1.86%
fib/200/run	114.6±0.52ms	113.3±0.60ms	-1.13%