Subroutine calls using the new JAL instruction

[Dentosal]

Description

This PR contains an initial implementtion of subroutine calls using the in-progress jump-and-link instruction JAL. It substantially reduces the function call overhead: the old code used 4 instructions per call, while the new version uses 1-3 depending on the distance to the called function.

Future optimizations

• Reorder functions, so those that call each other are adjacent
• Use absolute or IS-relative jumps where it makes sense, see optimization: use absolute jumps where it makes sense #7267

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[codspeed-hq]

CodSpeed Performance Report

Merging #7085 will not alter performance

_{Comparing dento/new-fncall (c4061ed) with master (8b75246)}

Summary

✅ 25 untouched benchmarks