feat(divan): support counter compatibility with a dummy implementation

[art049]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #115 will degrade performances by 68.42%

_{Comparing cod-866-missing-divan-counter-and-bench_group (127771a) with main (27c0199)}

Summary

⚡ 16 improvements
❌ 25 regressions
✅ 322 untouched
🆕 22 new

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

Benchmarks breakdown

	Mode	Benchmark	BASE	HEAD	Change
❌	WallTime	large_setup	18 ns	19 ns	-5.26%
⚡	WallTime	from_elem[4096]	371 ns	351 ns	+5.7%
⚡	WallTime	from_elem[8192]	550 ns	533 ns	+3.19%
⚡	WallTime	from_elem_decimal[1024]	84 ns	80 ns	+5%
❌	Instrumentation	bench_array1[4]	154.4 ns	183.6 ns	-15.89%
❌	Instrumentation	bench_array2[4]	154.4 ns	183.6 ns	-15.89%
❌	Instrumentation	init_array[4]	154.4 ns	183.6 ns	-15.89%
❌	Instrumentation	sleep_100ms	566.1 ns	595.3 ns	-4.9%
❌	Instrumentation	sleep_100ms_with_custom_sample	566.1 ns	595.3 ns	-4.9%
❌	Instrumentation	sleep_10ms	566.1 ns	595.3 ns	-4.9%
❌	Instrumentation	sleep_1ms	566.1 ns	595.3 ns	-4.9%
❌	Instrumentation	sleep_50ms	566.1 ns	595.3 ns	-4.9%
🆕	Instrumentation	slice_into_vec_with_bytes	N/A	671.9 ns	N/A
🆕	WallTime	slice_into_vec_with_bytes	N/A	59 ns	N/A
🆕	Instrumentation	string_copy_with_bytes_counter	N/A	798.1 ns	N/A
🆕	WallTime	string_copy_with_bytes_counter	N/A	61 ns	N/A
🆕	Instrumentation	vec_copy_with_bytes_counter	N/A	887.5 ns	N/A
🆕	WallTime	vec_copy_with_bytes_counter	N/A	60 ns	N/A
🆕	Instrumentation	count_chars_in_string	N/A	730.3 ns	N/A
🆕	WallTime	count_chars_in_string	N/A	33 ns	N/A
...	...	...	...	...	...

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

[art049]

This fixes the counter part of #96