feat: add indexing data type kind

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/dtypes/README.md

@@ -85,6 +85,7 @@ The function supports the following data type kinds:
 -   `real`: real-valued data types.
 -   `numeric`: numeric data types.
 -   `typed`: typed data types.
+-   `indexing`: ndarray index data types.
 -   `all`: all data types.
 
 Additionally, the function supports extending the "kinds" listed above by appending an `_and_generic` suffix to the kind name (e.g., `real_and_generic`).

lib/node_modules/@stdlib/ndarray/dtypes/docs/repl.txt

@@ -32,6 +32,7 @@
     - real: real-valued data types.
     - numeric: numeric data types.
     - typed: typed data types.
+    - indexing: ndarray index data types.
     - all: all data types.
 
     Additionally, the function supports extending the "kinds" listed above by

lib/node_modules/@stdlib/ndarray/dtypes/lib/dtypes.json

@@ -90,5 +90,8 @@
     "uint32",
     "uint8",
     "uint8c"
+  ],
+  "indexing": [
+    "int32"
   ]
 }

lib/node_modules/@stdlib/ndarray/dtypes/test/test.js

@@ -497,6 +497,33 @@ tape( 'the function supports returning a list of numeric ndarray data types (inc
 	t.end();
 });
 
+tape( 'the function supports returning a list of indexing ndarray data types', function test( t ) {
+	var expected;
+	var actual;
+
+	expected = [
+		'int32'
+	];
+	actual = dtypes( 'indexing' );
+
+	t.deepEqual( actual, expected, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function supports returning a list of indexing ndarray data types (including "generic")', function test( t ) {
+	var expected;
+	var actual;
+
+	expected = [
+		'int32',
+		'generic'
+	];
+	actual = dtypes( 'indexing_and_generic' );
+
+	t.deepEqual( actual, expected, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function returns an empty array if provided an unrecognized data type kind', function test( t ) {
 	t.deepEqual( dtypes( 'beep' ), [], 'returns expected value' );
 	t.deepEqual( dtypes( 'beep_and_generic' ), [], 'returns expected value' );