[9.x] Add ascii and ulid validation rules (#8397)

* add `ascii` and `ulid` validation rules

* Update validation.md

Co-authored-by: Taylor Otwell <taylor@laravel.com>

validation.md

@@ -806,6 +806,7 @@ Below is a list of all available validation rules and their function:
 [Alpha Dash](#rule-alpha-dash)
 [Alpha Numeric](#rule-alpha-num)
 [Array](#rule-array)
+[Ascii](#rule-ascii)
 [Bail](#rule-bail)
 [Before (Date)](#rule-before)
 [Before Or Equal (Date)](#rule-before-or-equal)
@@ -883,6 +884,7 @@ Below is a list of all available validation rules and their function:
 [Unique (Database)](#rule-unique)
 [Uppercase](#rule-uppercase)
 [URL](#rule-url)
+[ULID](#rule-ulid)
 [UUID](#rule-uuid)
 
 </div>
@@ -956,6 +958,11 @@ When additional values are provided to the `array` rule, each key in the input a
 
 In general, you should always specify the array keys that are allowed to be present within your array.
 
+<a name="rule-ascii"></a>
+#### ascii
+
+The field under validation must be entirely 7-bit ASCII characters.
+
 <a name="rule-bail"></a>
 #### bail
 
@@ -1635,6 +1642,11 @@ The field under validation must be uppercase.
 
 The field under validation must be a valid URL.
 
+<a name="rule-ulid"></a>
+#### ulid
+
+The field under validation must be a valid [Universally Unique Lexicographically Sortable Identifier](https://github.com/ulid/spec) (ULID).
+
 <a name="rule-uuid"></a>
 #### uuid