feat: Adds useDeepEquality for creating observables

[amondnet]

Describe the changes proposed in this Pull Request.

Make the change in 2.2.3 optional. If you want the use this behavior , modify @observable to @MakeObservable(useDeepEquality: true).

Fixes #969

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Pull Request Checklist

• If the changes are being made to code, ensure the version in pubspec.yaml is updated.
• Increment the major/minor/patch/patch-count, depending on the complexity of change
• Add the necessary unit tests to ensure the coverage does not drop
• Update the Changelog to include all changes made in this PR, organized by version
• Run the melos run set_version command from the root directory
• Include the necessary reviewers for the PR
• Update the docs if there are any API changes or additions to functionality

[netlify]

👷 Deploy request for mobx pending review.

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🔨 Latest commit	33c8881

[codecov]

Codecov Report

Merging #971 (2faae45) into main (52515a1) will decrease coverage by 0.10%.
The diff coverage is 80.00%.

❗ Current head 2faae45 differs from pull request most recent head 33c8881. Consider uploading reports for the commit 33c8881 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #971      +/-   ##
==========================================
- Coverage   99.00%   98.90%   -0.10%     
==========================================
  Files          57       57              
  Lines        2005     2006       +1     
==========================================
- Hits         1985     1984       -1     
- Misses         20       22       +2     

Flag	Coverage Δ
flutter_mobx	100.00% <ø> (ø)
mobx	98.42% <75.00%> (-0.15%)	⬇️
mobx_codegen	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
mobx/lib/src/api/annotations.dart	80.00% <100.00%> (ø)
mobx/lib/src/core/atom_extensions.dart	100.00% <100.00%> (ø)
mobx_codegen/lib/src/template/observable.dart	100.00% <100.00%> (ø)
mobx/lib/src/utils.dart	81.81% <50.00%> (-18.19%)	⬇️

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[pavanpodila]

LGTM