remove old c++ api

[myrrc]

This is first pr in a stack for migrating to new c++ api.

[codspeed-hq]

Merging this PR will not alter performance

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 8 improved benchmarks
❌ 5 regressed benchmarks
✅ 1693 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	chunked_varbinview_canonical_into[(1000, 10)]	154 µs	191.2 µs	-19.44%
❌	Simulation	encode_varbin[(1000, 4)]	139 µs	157.7 µs	-11.81%
❌	Simulation	chunked_varbinview_into_canonical[(100, 100)]	271.6 µs	306.7 µs	-11.46%
❌	Simulation	encode_varbin[(1000, 8)]	139.9 µs	157.6 µs	-11.27%
❌	Simulation	encode_varbin[(1000, 2)]	138.5 µs	154.7 µs	-10.46%
⚡	Simulation	chunked_bool_canonical_into[(1000, 10)]	26.5 µs	16.2 µs	+63.99%
⚡	Simulation	chunked_varbinview_into_canonical[(1000, 10)]	205.7 µs	169.5 µs	+21.36%
⚡	Simulation	chunked_varbinview_opt_canonical_into[(1000, 10)]	205.8 µs	169.8 µs	+21.2%
⚡	Simulation	chunked_varbinview_opt_into_canonical[(1000, 10)]	219.5 µs	183.3 µs	+19.76%
⚡	Simulation	chunked_varbinview_canonical_into[(100, 100)]	258.5 µs	223.6 µs	+15.61%
⚡	Simulation	bitwise_not_vortex_buffer_mut[128]	244.4 ns	215.3 ns	+13.55%
⚡	Simulation	compare_int_constant	298.7 µs	268.8 µs	+11.14%
⚡	Simulation	bitwise_not_vortex_buffer_mut[1024]	304.7 ns	275.6 ns	+10.58%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing myrrc/rm-cxx (9670382) with develop (a6513a0)}