feat: add half-precision complex data type

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/dtype-desc/lib/table.js

@@ -32,6 +32,7 @@ function table() {
 
 		'bool': 'boolean',
 
+		'complex32': 'half-precision floating-point complex number',
 		'complex64': 'single-precision floating-point complex number',
 		'complex128': 'double-precision floating-point complex number',
 

lib/node_modules/@stdlib/ndarray/base/dtype-desc/test/test.js

@@ -30,6 +30,7 @@ var dtypeDesc = require( './../lib' );
 var DTYPES = [
 	'float64',
 	'float32',
+	'float16',
 	'int8',
 	'uint8',
 	'uint8c',
@@ -41,6 +42,7 @@ var DTYPES = [
 	'uint64',
 	'binary',
 	'generic',
+	'complex32',
 	'complex64',
 	'complex128',
 	'bool'