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

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

[codecov[bot]]

Codecov Report

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

Additional details and impacted files

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[subzero911]

@pavanpodila

[netlify[bot]]

✅ Deploy Preview for mobx canceled.

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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