remove: remove stats/base/snanmeanpn from namespace

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

BREAKING CHANGE: remove `stats/base/snanmeanpn`

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

Ref: #4797

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Author: aayush0325

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

@@ -103,7 +103,6 @@ import smeanors = require( '@stdlib/stats/base/smeanors' );
 import smeanpn = require( '@stdlib/stats/base/smeanpn' );
 import smidrange = require( '@stdlib/stats/base/smidrange' );
 import snanmean = require( '@stdlib/stats/base/snanmean' );
-import snanmeanpn = require( '@stdlib/stats/base/snanmeanpn' );
 import snanmeanwd = require( '@stdlib/stats/base/snanmeanwd' );
 import snanmin = require( '@stdlib/stats/base/snanmin' );
 import snanminabs = require( '@stdlib/stats/base/snanminabs' );
@@ -2353,32 +2352,6 @@ interface Namespace {
 	*/
 	snanmean: typeof snanmean;
 
-	/**
-	* Computes the arithmetic mean of a single-precision floating-point strided array, ignoring `NaN` values and using a two-pass error correction algorithm.
-	*
-	* @param N - number of indexed elements
-	* @param x - input array
-	* @param strideX - stride length
-	* @returns arithmetic mean
-	*
-	* @example
-	* var Float32Array = require( '@stdlib/array/float32' );
-	*
-	* var x = new Float32Array( [ 1.0, -2.0, NaN, 2.0 ] );
-	*
-	* var v = ns.snanmeanpn( x.length, x, 1 );
-	* // returns ~0.3333
-	*
-	* @example
-	* var Float32Array = require( '@stdlib/array/float32' );
-	*
-	* var x = new Float32Array( [ 1.0, -2.0, NaN, 2.0 ] );
-	*
-	* var v = ns.snanmeanpn.ndarray( x.length, x, 1, 0 );
-	* // returns ~0.3333
-	*/
-	snanmeanpn: typeof snanmeanpn;
-
 	/**
 	* Computes the arithmetic mean of a single-precision floating-point strided array, ignoring `NaN` values and using Welford's algorithm.
 	*

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

@@ -783,15 +783,6 @@ setReadOnly( ns, 'smidrange', require( '@stdlib/stats/base/smidrange' ) );
 */
 setReadOnly( ns, 'snanmean', require( '@stdlib/stats/base/snanmean' ) );
 
-/**
-* @name snanmeanpn
-* @memberof ns
-* @readonly
-* @type {Function}
-* @see {@link module:@stdlib/stats/base/snanmeanpn}
-*/
-setReadOnly( ns, 'snanmeanpn', require( '@stdlib/stats/base/snanmeanpn' ) );
-
 /**
 * @name snanmeanwd
 * @memberof ns