feat(utilities): expose Arr to the docs (#780)

* docs(utilities): expose `Arr` to the docs

Fixes this error:

> [warning] `Arr`, defined in
> `./projects/utilities/packages/utilities/src/lib/types.ts`,
> is referenced by `AbstractCtor.A` but not included in the documentation

* feat: rename `Arr` to `AnyReadonlyArray`

If you get a compiler error, just rename your code.
This type was previously meant to be internal
so we deemed this a minor version and not a major.

packages/utilities/src/lib/types.ts

@@ -60,19 +60,18 @@ export type ArgumentTypes<F extends (...args: any[]) => unknown> = F extends (..
 
 /**
  * A readonly array of any values.
- * @private
  */
-export type Arr = readonly any[];
+export type AnyReadonlyArray = readonly any[];
 
 /**
  * A generic constructor with parameters
  */
-export type Ctor<A extends Arr = readonly any[], R = any> = new (...args: A) => R;
+export type Ctor<A extends AnyReadonlyArray = readonly any[], R = any> = new (...args: A) => R;
 
 /**
  * A generic abstract constructor with parameters
  */
-export type AbstractCtor<A extends Arr = readonly any[], R = any> = abstract new (...args: A) => R;
+export type AbstractCtor<A extends AnyReadonlyArray = readonly any[], R = any> = abstract new (...args: A) => R;
 
 /**
  * A generic constructor without parameters