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WordPress's `get_option()` function generally relies on making individual database requests for each option, however with the majority of options (in most cases) being autoloaded, i.e. fetched once with a single database request and then stored in (memory) cache. As part of a greater effort to reduce the amount of options that are unnecessarily autoloaded, this changeset introduces an alternative way to retrieve multiple options in a performant manner, with a single database request. This provides a reasonable alternative for e.g. plugins that use several options which only need to be loaded in a few specific screens. Specifically, this changeset introduces the following functions: * `prime_options( $options )` is the foundation to load multiple specific options with a single database request. Only options that aren't already cached (in `alloptions` or an individual cache) are retrieved from the database. * `prime_options_by_group( $option_group )` is a convenience wrapper function for the above which allows to prime all options of a specific option group (as configured via `register_setting()`). * `get_options( $options )` is another wrapper function which first primes the requested options and then returns them in an associative array, calling `get_option()` for each of them. Props mukesh27, joemcgill, costdev, olliejones. Fixes #58962. git-svn-id: https://develop.svn.wordpress.org/trunk@56445 602fd350-edb4-49c9-b593-d223f7449a82