feat: add wrapper struct for macros manifest

[vlopes11]

This commit introduces a wrapper struct to encapsulate the macros manifest behavior.

It is intended to make it easier to change resolve strategies in the future (i.e. add full qualified module path for the appropriate manifest section, etc)

[codecov]

Codecov Report

Merging #895 (6b88336) into nightly (0a24457) will decrease coverage by 0.4%.
The diff coverage is 30.4%.

Files Changed	Coverage Δ
module-system/sov-modules-macros/src/manifest.rs	39.3% <30.4%> (-47.5%)	⬇️

... and 2 files with indirect coverage changes