Added Revision Limit field in Settings>Writing

[tirth-doshi-techno]

I've added a "Default Revision Limit" field in the Settings -> Writing page. Right now it is just HTML only which helps to store the value for revision limit. Other functionality in progress.

Trac ticket: https://core.trac.wordpress.org/ticket/62119

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Props tirth03.

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[github-actions]

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