Observer excludedchild

[subzero911]

I got feedback from my fellows that it's unclear that "withChild" is actually "without child"!
So I renamed Observer.withChild to Observer.excludedChild.

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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

[codecov]

Codecov Report

Merging #958 (9741494) into main (d7dbbf5) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #958   +/-   ##
=======================================
  Coverage   98.99%   98.99%           
=======================================
  Files          57       57           
  Lines        1998     1998           
=======================================
  Hits         1978     1978           
  Misses         20       20           

Flag	Coverage Δ
flutter_mobx	100.00% <100.00%> (ø)
mobx	98.55% <ø> (ø)
mobx_codegen	100.00% <ø> (ø)

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

Files	Coverage Δ
flutter_mobx/lib/src/observer.dart	100.00% <100.00%> (ø)

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[subzero911]

@pavanpodila

[pavanpodila]

Can we also add a quick documentation item for the Observer: https://mobx.netlify.app/api/observers. Then we are done with the basics.

[netlify]

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[pavanpodila]

Can we also add a quick documentation item for the Observer: https://mobx.netlify.app/api/observers. Then we are done with the basics.

Essentially adding a documentation note for withBuiltChild factory method

[subzero911]

Okay, I'll try.
But didn't edit the docs before (specifically, this MDX format).

[pavanpodila]

Okay, I'll try. But didn't edit the docs before (specifically, this MDX format).

Ok, let's do this. We can close this PR for code and create a separate one for the docs