Add a lint for strpos === 0 to use str_starts_with

[spacedmonkey]

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Add a lint for strpos === 0 to use str_starts_with and the opposite. See hhttps://core.trac.wordpress.org/changeset/55703. str_starts_with is a php 8.0 function but a polyfill was added in core in WP 5.9. WordPress/wordpress-develop@1046682

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[spacedmonkey]

Related #2261 .

[jrfnl]

Note: This type of sniff should be created in the Modernize standard in PHPCSExtra and then used by WPCS.