feat(divan): placeholder implementation of counter

[art049]

No description provided.

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #115 will degrade performances by 23.49%

_{Comparing cod-866-missing-divan-counter-and-bench_group (8f34694) with main (88f18b7)}

Summary

⚡ 7 improvements
❌ 6 regressions
✅ 154 untouched benchmarks
🆕 11 new benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	bench_array1[4]	154.4 ns	183.6 ns	-15.89%
❌	bench_array2[4]	154.4 ns	183.6 ns	-15.89%
❌	init_array[4]	154.4 ns	183.6 ns	-15.89%
⚡	mut_borrow	924.2 ns	895 ns	+3.26%
🆕	slice_into_vec_with_bytes	N/A	642.8 ns	N/A
🆕	string_copy_with_bytes_counter	N/A	768.9 ns	N/A
🆕	vec_copy_with_bytes_counter	N/A	829.2 ns	N/A
🆕	count_chars_in_string	N/A	701.1 ns	N/A
🆕	uppercase_chars_with_counter	N/A	2.1 µs	N/A
🆕	hash_computation_cycles	N/A	512.5 ns	N/A
🆕	simulated_processing_cycles	N/A	2 µs	N/A
🆕	filter_items_with_counter	N/A	4.8 µs	N/A
🆕	process_items_with_counter	N/A	806.7 ns	N/A
🆕	process_with_multiple_counters	N/A	582.5 ns	N/A
🆕	string_processing_multi_counter	N/A	3.7 µs	N/A
⚡	add	120.6 ns	91.4 ns	+31.91%
❌	div	95 ns	124.2 ns	-23.49%
⚡	iterative[0]	148.3 ns	119.2 ns	+24.48%
❌	recursive_memoized[BTreeMap<u64, u64>, 0]	342.5 ns	400.8 ns	-14.55%
⚡	recursive_memoized[HashMap<u64, u64>, 0]	1,045.8 ns	956.1 ns	+9.38%
...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.