feat: add half-precision data types

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/dtype2c/lib/table.json

@@ -1,9 +1,10 @@
 {
   "binary": null,
   "bool": "bool",
+  "complex32": "stdlib_complex32_t",
   "complex64": "stdlib_complex64_t",
   "complex128": "stdlib_complex128_t",
-  "float16": null,
+  "float16": "stdlib_float16_t",
   "bfloat16": null,
   "float32": "float",
   "float64": "double",

lib/node_modules/@stdlib/ndarray/base/dtype2c/test/test.js

@@ -41,6 +41,7 @@ tape( 'the function returns the C data type associated with a provided data type
 	values = [
 		'float64',
 		'float32',
+		'float16',
 		'int8',
 		'uint8',
 		'uint8c',
@@ -52,6 +53,7 @@ tape( 'the function returns the C data type associated with a provided data type
 		'uint64',
 		'binary',
 		'generic',
+		'complex32',
 		'complex64',
 		'complex128',
 		'bool'
@@ -60,6 +62,7 @@ tape( 'the function returns the C data type associated with a provided data type
 	expected = [
 		'double',
 		'float',
+		'stdlib_float16_t',
 		'int8_t',
 		'uint8_t',
 		null,
@@ -71,6 +74,7 @@ tape( 'the function returns the C data type associated with a provided data type
 		'uint64_t',
 		null,
 		null,
+		'stdlib_complex32_t',
 		'stdlib_complex64_t',
 		'stdlib_complex128_t',
 		'bool'