Remove needless CallableArrayType and CallableStringType (#30)

Since this can be expressed through:
- String callable: `callable&string`
- Static array method: `callable&list{class-string, string}`
- Instance array method: `callable&list{object, string}`

Does it make sense to add factory methods for `callable-string` and
`callable-array` to the `types` ?
These are quite rare types and the chance that someone will ever use
these methods is small.

src/TypeVisitor.php

@@ -71,9 +71,6 @@ public function visitNamedClassString(NamedClassStringType $type): mixed;
     /** @return TReturn */
     public function visitClassString(ClassStringType $type): mixed;
 
-    /** @return TReturn */
-    public function visitCallableString(CallableStringType $type): mixed;
-
     /** @return TReturn */
     public function visitInterfaceString(InterfaceStringType $type): mixed;
 
@@ -113,9 +110,6 @@ public function visitArrayShape(ArrayShapeType $type): mixed;
     /** @return TReturn */
     public function visitNonEmptyArray(NonEmptyArrayType $type): mixed;
 
-    /** @return TReturn */
-    public function visitCallableArray(CallableArrayType $type): mixed;
-
     /** @return TReturn */
     public function visitArray(ArrayType $type): mixed;
 

src/types.php

@@ -25,7 +25,6 @@ final class types
     public const literalString = AnyLiteralStringType::type;
     public const numericString = NumericStringType::type;
     public const classString = ClassStringType::type;
-    public const callableString = CallableStringType::type;
     public const interfaceString = InterfaceStringType::type;
     public const enumString = EnumStringType::type;
     public const traitString = TraitStringType::type;
@@ -35,7 +34,6 @@ final class types
     public const string = StringType::type;
     public const numeric = NumericType::type;
     public const scalar = ScalarType::type;
-    public const callableArray = CallableArrayType::type;
     public const object = ObjectType::type;
     public const resource = ResourceType::type;
     public const closedResource = ClosedResourceType::type;

tests/PsalmTest.php

@@ -30,8 +30,6 @@ public static function extractType(Type $_type): mixed
     #[TestWith([__DIR__ . '/psalm/ArrayShapeType.phpt'])]
     #[TestWith([__DIR__ . '/psalm/ArrayType.phpt'])]
     #[TestWith([__DIR__ . '/psalm/BoolType.phpt'])]
-    #[TestWith([__DIR__ . '/psalm/CallableArrayType.phpt'])]
-    #[TestWith([__DIR__ . '/psalm/CallableStringType.phpt'])]
     #[TestWith([__DIR__ . '/psalm/CallableType.phpt'])]
     #[TestWith([__DIR__ . '/psalm/ClassConstantType.phpt'])]
     #[TestWith([__DIR__ . '/psalm/ClassStringLiteralType.phpt'])]