feat(baremetal): add message signing contract

[Laure-di]

Community Note

• Please vote on this pull request by adding a 👍 reaction to the original pull request comment to help the community and maintainers prioritize this request.
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for pull request followers and do not help prioritize the request

Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 42.85714% with 8 lines in your changes missing coverage. Please review.

Project coverage is 70.69%. Comparing base (5bf53e0) to head (c7a037f).
Report is 427 commits behind head on master.

Files with missing lines	Patch %	Lines
.../namespaces/applesilicon/v1alpha1/custom_server.go	11.11%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4407      +/-   ##
==========================================
- Coverage   75.45%   70.69%   -4.77%     
==========================================
  Files         202      297      +95     
  Lines       44323    65890   +21567     
==========================================
+ Hits        33444    46578   +13134     
- Misses       9653    17669    +8016     
- Partials     1226     1643     +417     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.