Refactor imports handling

[well-mannered-goat]

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

Added a struct to store the values instead of looking them up each time for each reloc.

Test plan

...

Closing issues

closes #5206

[well-mannered-goat]

I was thinking of also adding some of such sections to the struct ?

[codecov]

Codecov Report

❌ Patch coverage is 68.18182% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.70%. Comparing base (d0a0b6e) to head (e67f614).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
librz/bin/format/elf/elf_imports.c	50.00%	3 Missing and 11 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
librz/bin/format/elf/elf.c	79.00% <100.00%> (+1.82%)	⬆️
librz/bin/format/elf/elf_imports.c	66.05% <50.00%> (-1.39%)	⬇️

... and 11 files with indirect coverage changes

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