[13.x] Expose new countColumns parameter to control the columns of getCountForPagination

[pfabri-ebrand]

Summary

The idea behind this PR is to be able to control the fields used by the getCountForPagination/runPaginationCountQuery and have slightly better performant queries when the count is done on table with many fields

[shaedrich]

You may want to narrow this further down

Suggested change

	* @param int|null|\Closure $total
	* @param array $countColumns
	* @param int|null|\Closure(): int $total
	* @param array<int, string> $countColumns

or

Suggested change

	* @param int|null|\Closure $total
	* @param array $countColumns
	* @param int|null|\Closure(): int $total
	* @param string[] $countColumns

or

Suggested change

	* @param int|null|\Closure $total
	* @param array $countColumns
	* @param int|null|\Closure(): int $total
	* @param list<string> $countColumns

[pfabri-ebrand]

I'm just matching the existing phpdoc style

[shaedrich]

There's always a chance to improve, but not if one always takes the worst example as their guiding principle 😉

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!