feat: add scheduler option to autorun and reaction

[amondnet]

Describe the changes proposed in this Pull Request.

If the PR fixes a specific issue, reference the issue with Fixes #.

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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 rejected.

Name	Link
🔨 Latest commit	3eca215

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (00fe8b0) 99.00% compared to head (3eca215) 99.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #979   +/-   ##
=======================================
  Coverage   99.00%   99.00%           
=======================================
  Files          57       57           
  Lines        2017     2017           
=======================================
  Hits         1997     1997           
  Misses         20       20           

Flag	Coverage Δ
flutter_mobx	100.00% <ø> (ø)
mobx	98.56% <100.00%> (ø)
mobx_codegen	100.00% <ø> (ø)
mobx_lint	?

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

Files	Coverage Δ
mobx/lib/src/api/reaction.dart	100.00% <ø> (ø)
mobx/lib/src/core/reaction_helper.dart	96.36% <100.00%> (ø)

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