remove: remove nanmean from namespace

This commit removes the `nanmean` symbol from the `@stdlib/stats/base` namespace due to a package migration.

BREAKING CHANGE: remove `nanmean`

To migrate, users should access the same symbol via the `@stdlib/stats/strided` namespace.

Ref: #4797

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type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
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Author: gururaj1512

lib/node_modules/@stdlib/stats/base/docs/types/index.d.ts

@@ -25,7 +25,6 @@ import cumaxabs = require( '@stdlib/stats/base/cumaxabs' );
 import cumin = require( '@stdlib/stats/base/cumin' );
 import cuminabs = require( '@stdlib/stats/base/cuminabs' );
 import dists = require( '@stdlib/stats/base/dists' );
-import nanmean = require( '@stdlib/stats/base/nanmean' );
 import nanmskmax = require( '@stdlib/stats/base/nanmskmax' );
 import nanmskmin = require( '@stdlib/stats/base/nanmskmin' );
 import nanmskrange = require( '@stdlib/stats/base/nanmskrange' );
@@ -204,28 +203,6 @@ interface Namespace {
 	*/
 	dists: typeof dists;
 
-	/**
-	* Computes the arithmetic mean of a strided array, ignoring `NaN` values.
-	*
-	* @param N - number of indexed elements
-	* @param x - input array
-	* @param stride - stride length
-	* @returns arithmetic mean
-	*
-	* @example
-	* var x = [ 1.0, -2.0, NaN, 2.0 ];
-	*
-	* var v = ns.nanmean( x.length, x, 1 );
-	* // returns ~0.3333
-	*
-	* @example
-	* var x = [ 1.0, -2.0, NaN, 2.0 ];
-	*
-	* var v = ns.nanmean.ndarray( x.length, x, 1, 0 );
-	* // returns ~0.3333
-	*/
-	nanmean: typeof nanmean;
-
 	/**
 	* Computes the maximum value of a strided array according to a mask, ignoring `NaN` values.
 	*

lib/node_modules/@stdlib/stats/base/lib/index.js

@@ -81,15 +81,6 @@ setReadOnly( ns, 'cuminabs', require( '@stdlib/stats/base/cuminabs' ) );
 */
 setReadOnly( ns, 'dists', require( '@stdlib/stats/base/dists' ) );
 
-/**
-* @name nanmean
-* @memberof ns
-* @readonly
-* @type {Function}
-* @see {@link module:@stdlib/stats/base/nanmean}
-*/
-setReadOnly( ns, 'nanmean', require( '@stdlib/stats/base/nanmean' ) );
-
 /**
 * @name nanmskmax
 * @memberof ns