perf(scripts): improve performance benchmarking accuracy

[cawalch]

• Replaces deprecated benchmark with tinybench
• Updates scripts/perf.js to use tinybench
• Enforces warm-up and garbage collection (gc between runs may not be needed, but it should minimize interference)

npm run perf

> @jmespath-community/[email protected] perf
> node --expose-gc scripts/perf.js

┌─────────┬─────────────────────────────────┬──────────────┬────────────────────┬──────────┬──────────┐
│ (index) │ Task Name                       │ ops/sec      │ Average Time (ns)  │ Margin   │ Samples  │
├─────────┼─────────────────────────────────┼──────────────┼────────────────────┼──────────┼──────────┤
│ 0       │ 'Parser#single_expr'            │ '14,010,279' │ 71.37616207528444  │ '±0.74%' │ 14010280 │
│ 1       │ 'Parser#single_subexpr'         │ '7,064,237'  │ 141.55808538731404 │ '±0.06%' │ 7064238  │
│ 2       │ 'Parser#deeply_nested_50'       │ '340,225'    │ 2939.2295062691283 │ '±0.57%' │ 340226   │
│ 3       │ 'Parser#deeply_nested_50_index' │ '196,826'    │ 5080.625386760879  │ '±0.52%' │ 196827   │
│ 4       │ 'Parser#basic_list_projection'  │ '3,958,033'  │ 252.6507331664748  │ '±0.61%' │ 3958034  │
└─────────┴─────────────────────────────────┴──────────────┴────────────────────┴──────────┴──────────┘

[springcomp]

That looks awesome.
Thanks for the contribution.