feat: groth16 return object in-memory

[ibmp33]

fix ##267

Task	CPU	CPU with Cache	GPU	GPU with Cache
t1: Initialize the WitnessCalculator from the specified WASM_FILE	0.1	0.1	0.1	0.1
t2: Load inputs from INPUT_FILE, and calculate the witness	43.4	40.5	43.1	40.8
t3: Read the proving key (pk) from the specified ZKEY_FILE	6.4	-	13.1	-
t4: Create a CircomCircuit from the CIRCUIT_FILE using the calculated witness values	50.1	2.7	50.0	4.0
t5: Generate a Groth16 proof using the proving key (pk) and the created circuit (CircomCircuit)	33.6	37.6	14.7	14.1
Total Time	133.6	80.9	121.0	59.0

[eigmax]

@ibmp33 if we have return the whole structure, we don't have to write them into local file. Meanwhile, you can change the groth16_setup_and_cache to groth16_setup_inplace and remove the arguments xx_file.