move interop-cpp examples to sv2-ffi crate

[plebhash]

similar to #1404

this PR moves the interop-cpp examples to sv2-ffi crate

builds on top of #1405

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 19.05%. Comparing base (c605e0d) to head (35acbe7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1407      +/-   ##
==========================================
- Coverage   19.08%   19.05%   -0.03%     
==========================================
  Files         166      167       +1     
  Lines       11066    11081      +15     
==========================================
  Hits         2112     2112              
- Misses       8954     8969      +15     

Flag	Coverage Δ
binary_codec_sv2-coverage	0.00% <ø> (ø)
binary_serde_sv2-coverage	3.54% <ø> (-0.02%)	⬇️
binary_sv2-coverage	5.33% <ø> (-0.02%)	⬇️
bip32_derivation-coverage	0.00% <ø> (ø)
buffer_sv2-coverage	25.02% <ø> (ø)
codec_sv2-coverage	0.01% <ø> (-0.01%)	⬇️
common_messages_sv2-coverage	0.13% <ø> (-0.01%)	⬇️
const_sv2-coverage	0.00% <ø> (ø)
error_handling-coverage	0.00% <ø> (ø)
framing_sv2-coverage	0.28% <ø> (-0.01%)	⬇️
jd_client-coverage	0.00% <ø> (ø)
jd_server-coverage	7.79% <ø> (ø)
job_declaration_sv2-coverage	0.00% <ø> (ø)
key-utils-coverage	2.39% <ø> (ø)
mining-coverage	2.42% <ø> (-0.01%)	⬇️
mining_device-coverage	0.00% <ø> (ø)
mining_proxy_sv2-coverage	0.70% <ø> (ø)
noise_sv2-coverage	4.43% <ø> (-0.02%)	⬇️
pool_sv2-coverage	2.04% <ø> (ø)
protocols	24.52% <ø> (-0.06%)	⬇️
roles	6.54% <ø> (ø)
roles_logic_sv2-coverage	7.91% <ø> (-0.03%)	⬇️
sv2_ffi-coverage	0.00% <ø> (ø)
template_distribution_sv2-coverage	0.00% <ø> (ø)
translator_sv2-coverage	9.60% <ø> (ø)
utils	25.13% <ø> (?)
v1-coverage	2.40% <ø> (-0.01%)	⬇️

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[plebhash]

turns out that adapting the scripts is not as simple as I initially thought

not sure this is worth spending time now, so I'll just close this PR