feat: enhance Float16Array constructor to handle Float16Array instances

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---

Author: gururaj1512

lib/node_modules/@stdlib/array/float16/lib/main.js

@@ -183,7 +183,11 @@ function Float16Array() {
 		if ( isNonNegativeInteger( arg ) ) {
 			buf = new Uint16Array( arg );
 		} else if ( isCollection( arg ) ) {
-			buf = fromArray( new Uint16Array( arg.length ), arg );
+			if ( isFloat16Array( arg ) ) {
+				buf = new Uint16Array( arg._buffer ); // eslint-disable-line no-underscore-dangle
+			} else {
+				buf = fromArray( new Uint16Array( arg.length ), arg );
+			}
 		} else if ( isArrayBuffer( arg ) ) {
 			if ( !isInteger( arg.byteLength/BYTES_PER_ELEMENT ) ) {
 				throw new RangeError( format( 'invalid argument. ArrayBuffer byte length must be a multiple of %u. Byte length: `%u`.', BYTES_PER_ELEMENT, arg.byteLength ) );