feat: add proposal procedures to tx builder

[AngelCastilloB]

Description

Add proposal procedures to TX builder, and add governance related examples.

Checklist

• I have read followed CONTRIBUTING.md
  • I have added tests
  • I have updated the documentation
  • I have updated the CHANGELOG
• Are there any breaking changes?
  • If yes: I have marked them in the CHANGELOG
• Does this PR introduce any platform specific code?
• Security: Does this PR potentially affect security?
• Performance: Does this PR potentially affect performance?

[github-actions]

MISRA Guideline Compliance Summary

Commit:	ea2a972a704d048b683fd892ef60073552e08466
Date:	2024-12-02
Guidelines:	MISRA C 2012
Checking Tool:	Cppcheck
Result:	Compliant ✅

🎉 No MISRA C 2012 Violations Found!

You can download the complete report from: MISRA C Report

[codecov]

Codecov Report

Attention: Patch coverage is 95.72519% with 28 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
lib/src/transaction_builder/transaction_builder.c	97.23%	16 Missing ⚠️
lib/src/transaction_body/transaction_output.c	76.92%	9 Missing ⚠️
lib/src/transaction_body/transaction_body.c	60.00%	2 Missing ⚠️
lib/src/address/internals/reward_addr_pack.c	50.00%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!