Clean up and small refactors to the access module

[ggonzalez94]

• Add comments where missing

• Small refactors

• Remove a check in Ownable that verifies that sender is the zero address

• Add a check to Ownable initializer that the owner is not being set to the zero address

• Tests

• Added entry to CHANGELOG.md

[ggonzalez94]

Should we update the Changelog to reflect any of these changes? I think ony the change in the initializer is worth calling out maybe

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.12%. Comparing base (4c0e16f) to head (0e71f5a).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1221      +/-   ##
==========================================
+ Coverage   92.06%   92.12%   +0.06%     
==========================================
  Files          49       49              
  Lines        1399     1397       -2     
==========================================
- Hits         1288     1287       -1     
+ Misses        111      110       -1     

Files with missing lines	Coverage Δ
...kages/access/src/accesscontrol/accesscontrol.cairo	73.33% <100.00%> (ø)
packages/access/src/ownable/ownable.cairo	81.25% <100.00%> (+0.39%)	⬆️
packages/security/src/initializable.cairo	100.00% <ø> (ø)

... and 3 files with indirect coverage changes

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[andrew-fleming]

Looking good! I left a few minor doc suggestions

[ericnordelo]

Looking good! The only missing things I see:

• Updating the doc site accordingly
• In line 69: {RoleAdminChanged} should use backticks instead.

[ggonzalez94]

All comments have been addressed and changelog has been updated.

[ericnordelo]

LGTM!

[immrsd]

Looking good, left a couple of comments

[andrew-fleming]

I left a final suggestion. Otherwise, LGTM!