🌱 Move applier to use Bundle interface

[perdasilva]

Description

Box the boxcutter, configuration, and helm efforts will require an architecture that allows for multiple bundle formats. This PR starts us on that path by creating the simplest Bundle interface:

type Bundle interface {
  FS() fs.FS
}

and updating the Applier to use it. We will want to also update the Resolver and the ImagePuller to use the Bundle interface / API.

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.77%. Comparing base (dff07d5) to head (e1f1911).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2160      +/-   ##
==========================================
- Coverage   72.79%   72.77%   -0.03%     
==========================================
  Files          79       80       +1     
  Lines        7340     7345       +5     
==========================================
+ Hits         5343     5345       +2     
- Misses       1651     1653       +2     
- Partials      346      347       +1     

Flag	Coverage Δ
e2e	44.39% <64.28%> (-0.04%)	⬇️
experimental-e2e	54.92% <64.28%> (-0.05%)	⬇️
unit	58.21% <71.42%> (-0.03%)	⬇️

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