feat(gpu_prover): implement low VRAM mode (#186) #803

Job	Run time
cargo fmt	42s
tests	1m 50s
risc_v_tests_delegations	1m 33s
circuits_generated	4m 23s
ISA tests for simulator	1m 25s
build_cli_no_verifiers	4m 40s
build_verifier	1m 8s
build_cli_with_verify	2m 8s
full_recursion_fast	2h 2m 53s
build_cli_no_verifiers_512	3m 5s
delegation_example	0s
basic_example	0s
large_example	0s
verification_example	0s
oh_bender_incremental_proofs	0s
full_recursion	-1s
	2h 23m 46s

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