Move definitions of BenchResult and dependencies to a separate file

[oleksandr-pavlyk]

Move definitions of BenchResult and downstream dependencies to separate file bench_result.py.

Similarly, moved definition of JsonCache singleton and functions that use to to a dedicate file json_cache.py, and definition of ProcessRunner class to process_runner.py.

The intent is to migrate bench_result.py to nvbench eventually to support using NVBench in hyper-parameter optimization tools.

Description

closes

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[oleksandr-pavlyk]

/ok to test 3122e05

[github-actions]

🥳 CI Workflow Results

🟩 Finished in 22m 39s: Pass: 100%/4 | Total: 1h 09m | Max: 22m 36s | Hits: 94%/2620

See results here.

[oleksandr-pavlyk]

Tested the change to Python scripts by invoking benchmarks/scripts.run.py:

Output of invoking run.py

cccl) coder ➜ ~/cccl/build/cuda13.1-gcc14/cub $ CUDA_VISIBLE_DEVICES=0 PYTHONPATH=${PYTHONPATH}:${HOME}/cccl/benchmarks/scripts python ~/cccl/benchmarks/scripts/run.py -R "^.*babelstream.*"
&&&& RUNNING bench
 ctk:  13.1.115
cccl:  v3.4.0.dev-503-g6e84c284b1
&&&& PERF cub_bench_transform_babelstream_mul_T_ct__I8___OffsetT_ct__I64___Elements_io__pow2__32 0.012579839676618576 -sec
&&&& PERF cub_bench_transform_babelstream_add_T_ct__I8___OffsetT_ct__I64___Elements_io__pow2__32 0.018774015828967094 -sec
&&&& PERF cub_bench_transform_babelstream_triad_T_ct__I8___OffsetT_ct__I64___Elements_io__pow2__32 0.018999295309185982 -sec
&&&& PERF cub_bench_transform_babelstream_nstream_T_ct__I8___OffsetT_ct__I64___Elements_io__pow2__32 0.02476160041987896 -sec
&&&& PERF cub_bench_transform_babelstream_mul_T_ct__I16___OffsetT_ct__I64___Elements_io__pow2__32 0.025427967309951782 -sec
&&&& PERF cub_bench_transform_babelstream_add_T_ct__I16___OffsetT_ct__I64___Elements_io__pow2__32 0.03751014173030853 -sec
&&&& PERF cub_bench_transform_babelstream_triad_T_ct__I16___OffsetT_ct__I64___Elements_io__pow2__32 0.03751833736896515 -sec
&&&& PERF cub_bench_transform_babelstream_nstream_T_ct__I16___OffsetT_ct__I64___Elements_io__pow2__32 0.048870399594306946 -sec
&&&& PERF cub_bench_transform_babelstream_mul_T_ct__F32___OffsetT_ct__I64___Elements_io__pow2__32 0.0503116138279438 -sec
&&&& PASSED bench