remove sv2-ffi crate

[plebhash]

close #1416

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 18.29%. Comparing base (f54512a) to head (2ef3fda).
Report is 331 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1417      +/-   ##
==========================================
- Coverage   19.20%   18.29%   -0.91%     
==========================================
  Files         166      154      -12     
  Lines       11107    10100    -1007     
==========================================
- Hits         2133     1848     -285     
+ Misses       8974     8252     -722     

Flag	Coverage Δ
binary_codec_sv2-coverage	0.00% <ø> (ø)
binary_serde_sv2-coverage	3.64% <ø> (+0.08%)	⬆️
binary_sv2-coverage	5.46% <ø> (+0.12%)	⬆️
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	0.29% <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	2.48% <ø> (+0.03%)	⬆️
mining_device-coverage	0.00% <ø> (ø)
mining_proxy_sv2-coverage	0.70% <ø> (ø)
noise_sv2-coverage	4.54% <ø> (+0.10%)	⬆️
pool_sv2-coverage	2.04% <ø> (ø)
protocols	22.96% <ø> (-1.79%)	⬇️
roles	3.78% <ø> (-2.76%)	⬇️
roles_logic_sv2-coverage	9.24% <ø> (+0.18%)	⬆️
sv2_ffi-coverage	?
template_distribution_sv2-coverage	0.00% <ø> (ø)
translator_sv2-coverage	?
utils	25.13% <ø> (ø)
v1-coverage	2.46% <ø> (+0.05%)	⬆️

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[GitGab19]

Still two things to remove:

• .github/workflows/sv2-header-check.yaml
• step called interop-test in ci job of .github/workflows/test.yaml

[GitGab19]

Since we didn't find any consensus on this, maybe it's better to close this PR for now.

We can always reopen it in the future.

What do you think @plebhash?