feat: add keepAlive to Computed

[amondnet]

Describe the changes proposed in this Pull Request.

This avoids suspending computed values when they are not being observed by anything (see the above explanation). Can potentially create memory leaks.

Fixes #975

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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

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (00fe8b0) 99.00% compared to head (4f3a787) 99.01%.

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Additional details and impacted files

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[pavanpodila]

Pls resolve the conflicts as we merged the previous PR that bumped the version

[amondnet]

@pavanpodila I rebased to the main branch and resolved the conflict.