Implement backup on overwriting migrated file (#5533)

[amibranch]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository.
• I made sure to follow the project's coding style.
• I've documented every RZ_API function and struct this PR changes.
• I've added tests that prove my changes are effective (required for changes to RZ_API).
• I've updated the Rizin book with the relevant information (if needed).
• I've used AI tools to generate fully or partially these code changes and I'm sure the changes are not copyrighted by somebody else.

Detailed description

This PR will add a backup-mechanism. This is done to preserve a project before it is migrated, in case the side-effects of a migration are not intended by a user.

Please NOTE:

• The API-changes were not really intended in the first place - they were just an easy solution. Feel free to reach out to me, how to avoid them or what needs to be considered
• Further discussions should also take place in the linked issue (to avoid spreading the discussions across multiple places).
• The free version of ChatGPT was used to create the compare_files-function, used in the integration test.

Test plan

To test this:

• Load a project file with a dated version (e.g. from test/prj/...) into rizin (e.g. via ./binrz/rizin/rizin -p ../test/prj/v1-noreturn.rzdb from build-dir)
• Verify that it is migrated accordingly (project migrated from version X to Y.)
• Save the file (e.g. while exiting rizin)
• Now, there should be a backup file next to the original file with the original version (e.g. .v1-noreturn.rzdb_1.BAK)
• This backup-file must be identical to the originally loaded project file - reloading it, must again trigger a migration!

Closing issues

#5533

[codecov]

Codecov Report

❌ Patch coverage is 46.42857% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.53%. Comparing base (141f05b) to head (d3bea46).
⚠️ Report is 26 commits behind head on dev.

Files with missing lines	Patch %	Lines
librz/core/project.c	43.75%	16 Missing and 11 partials ⚠️
librz/main/rizin.c	0.00%	2 Missing ⚠️
librz/core/project_migrate.c	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
librz/core/core.c	59.65% <100.00%> (+0.02%)	⬆️
librz/util/sdb/src/sdb.c	51.19% <100.00%> (+0.18%)	⬆️
librz/core/project_migrate.c	71.51% <66.66%> (-0.05%)	⬇️
librz/main/rizin.c	50.21% <0.00%> (-0.11%)	⬇️
librz/core/project.c	41.07% <43.75%> (+0.74%)	⬆️

... and 10 files with indirect coverage changes

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[Rot127]

Add a test to cover the lines in rizin.c please