Add missing & update existing validation attributes

[Klaas058]

I cross-referenced the validation attributes with the Laravel 9.x available validation rules and found that there are 18 validation rules that are not implemented as validation attributes yet.

I couldn't find information about which Laravel version this package needs to support, so depending on the version support, I would like to add the following:

• declined_if 8.71.0
• declined 8.71.0
• mac 8.77.0
• required_array_keys 8.82.0
• exclude_with 9.6.0
• doesnt_start_with 9.17.0
• doesnt_end_with 9.24.0
• min_digits 9.26.0
• max_digits 9.26.0
• uppercase 9.40.0
• lowercase 9.40.0
• ascii 9.44.0
• decimal 9.45.0
• missing_with_all 9.49.0
• missing_with 9.49.0
• missing_unless 9.49.0
• missing_if 9.49.0
• missing 9.49.0

I would like to open PR's to add these validation rules.

Also I found that exclude is implemented but not referenced in the docs, the sibling attributes are referenced. The implementation of the exclude however needs an instance of the ExcludeIf class to be passed as a parameter. It would make more sense to implement it like the RequiredIf is implemented

• Update the implementation of ExcludeIf

Lastly, the alpha, alpha_dash, and alpha_numeric received an update in 9.49.0 to add the ascii parameter. These could also be updated.

• Update the implementations of Alpha, AlphaDash, AlphaNumeric

There are probably more to update, but these are the ones I found.

[rubenvanassche]

Looks like a great idea! Already saw some PR's coming in, thanks!