allow precognitive requests to use wildcards with array validations (#57437)

[markusheinemann]

This PR is a proposal to resolve #57437.

With this change, users can specify a wildcard to trigger all validation rules for an array field when using precognitive requests. Before the change the user had to specify all array validation rules manually in the Precognition-Validate-Only header. Now wildcards can specified to cover all array entries.

// Before
Precognition-Validate-Only: nested_array,nested_array.0.title,nested_array.1.title,nested_array.2.title
Precognition-Validate-Only: raw_array,raw_array.0,raw_array.1,raw_array.2

// After
Precognition-Validate-Only: nested_array,nested_array.*.title
Precognition-Validate-Only: raw_array,raw_array.*

PS. This is my first PR for Laravel so please forgive me mistakes. I appreciate any feedback :)