feat: add cusum to namespace

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
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    status: passed
  - task: lint_editorconfig
    status: passed
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    status: passed
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    status: passed
---

Author: kgryte

lib/node_modules/@stdlib/blas/ext/lib/index.js

@@ -45,6 +45,15 @@ var ns = {};
 */
 setReadOnly( ns, 'base', require( '@stdlib/blas/ext/base' ) );
 
+/**
+* @name cusum
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/blas/ext/cusum}
+*/
+setReadOnly( ns, 'cusum', require( '@stdlib/blas/ext/cusum' ) );
+
 /**
 * @name sum
 * @memberof ns