Linker API Changes

[george-cosma]

Pull Request Overview

This pull request changes the RuntimeInstance API to be compatible with the #87 linker proposal. The PR follows the proposal highlighted in issue #83, more precisely this comment. This was made to avoid the multitude of functions that would be create when introducing the idea of "modules" and "module_index"

Formatting

• Ran cargo fmt
• Ran cargo check
• Ran cargo build
• Ran cargo doc
• Ran nix fmt

Github Issue

This pull request helps close #83

[george-cosma]

I recommend looking at the first commit and the last. The one in the middle only changes the tests.

[codecov]

Codecov Report

Attention: Patch coverage is 78.15126% with 26 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/execution/mod.rs	81.73%	13 Missing and 6 partials ⚠️
src/execution/function_ref.rs	53.33%	7 Missing ⚠️

Files with missing lines	Coverage Δ
src/execution/function_ref.rs	53.33% <53.33%> (ø)
src/execution/mod.rs	91.22% <81.73%> (-5.17%)	⬇️

[florianhartung]

LGTM

[nerodesu017]

LGTM