key-utils: make it no_std with a std default feature

[Georges760]

because a new std feature is intriduced, the Semver MINOR should be bumped

[codecov]

Codecov Report

Attention: Patch coverage is 11.11111% with 8 lines in your changes missing coverage. Please review.

Project coverage is 17.96%. Comparing base (3d22194) to head (010279d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
utils/key-utils/src/lib.rs	11.11%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1398      +/-   ##
==========================================
- Coverage   17.96%   17.96%   -0.01%     
==========================================
  Files         167      167              
  Lines       11926    11930       +4     
==========================================
  Hits         2143     2143              
- Misses       9783     9787       +4     

Flag	Coverage Δ
binary_codec_sv2-coverage	0.00% <ø> (ø)
binary_serde_sv2-coverage	3.40% <ø> (ø)
binary_sv2-coverage	5.11% <ø> (ø)
bip32_derivation-coverage	0.00% <0.00%> (ø)
buffer_sv2-coverage	24.88% <0.00%> (-0.15%)	⬇️
codec_sv2-coverage	0.01% <ø> (ø)
common_messages_sv2-coverage	0.12% <ø> (ø)
const_sv2-coverage	0.00% <ø> (ø)
error_handling-coverage	0.00% <0.00%> (ø)
framing_sv2-coverage	0.27% <ø> (ø)
jd_client-coverage	0.38% <ø> (ø)
jd_server-coverage	7.79% <ø> (ø)
job_declaration_sv2-coverage	0.00% <ø> (ø)
key-utils-coverage	2.38% <11.11%> (-0.01%)	⬇️
mining-coverage	2.32% <ø> (ø)
mining_device-coverage	0.00% <ø> (ø)
mining_proxy_sv2-coverage	0.70% <ø> (ø)
noise_sv2-coverage	4.25% <ø> (ø)
pool_sv2-coverage	2.04% <ø> (ø)
protocols	23.86% <ø> (ø)
roles	5.85% <ø> (ø)
roles_logic_sv2-coverage	8.70% <ø> (ø)
sv2_ffi-coverage	0.00% <ø> (ø)
template_distribution_sv2-coverage	0.00% <ø> (ø)
translator_sv2-coverage	8.74% <ø> (ø)
utils	25.04% <11.11%> (-0.09%)	⬇️
v1-coverage	2.31% <ø> (ø)

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