Use .ARM.attributes section to improve asm.cpu

[tnias]

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).
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Detailed description

This PR is an attempt to revive #4196 and get the feature in.

Parse through .ARM.attributes to find out more more details on the target CPU.
Those details are used to give hints to the disassembler for better results.
Currently only "cortexm" and "v8" are usable hints, so we only extract those.

TODO: some of the uleb128 length stuff is still wrong

Test plan

user@debian:~/rizin$ rz-test test/db/formats/elf/arm 
Running rz-test on linux-x64
Running from /home/user/rizin/test
Loaded 7 tests.
[7/7]                       7 OK      0 BR        0 XX     0 FX
Finished in 0 seconds.
user@debian:~/rizin$

Closing issues

Closes #3747

[codecov]

Codecov Report

❌ Patch coverage is 64.44444% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.71%. Comparing base (fff40f8) to head (f26bf57).
⚠️ Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
librz/bin/format/elf/elf_info.c	64.44%	30 Missing and 18 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
librz/bin/format/elf/elf_info.c	70.18% <64.44%> (-0.77%)	⬇️

... and 10 files with indirect coverage changes

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