feat: add MatrixOrientation type definition

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---

Author: kgryte

lib/node_modules/@stdlib/types/index.d.ts

@@ -1339,6 +1339,16 @@ declare module '@stdlib/types/blas' {
 	*/
 	type Layout = 'row-major' | 'column-major';
 
+	/**
+	* Matrix orientation.
+	*
+	* ## Notes
+	*
+	* -   **rows**: data is stored along matrix rows.
+	* -   **columns**: data is stored along matrix columns.
+	*/
+	type MatrixOrientation = 'rows' | 'columns';
+
 	/**
 	* Matrix triangle.
 	*