remove: remove thunk from namespace

This commit removes the `thunk` symbol from the `@stdlib/utils`
namespace due to a package migration.

BREAKING CHANGE: remove `thunk`

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

Author: Neerajpathak07

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

@@ -202,7 +202,6 @@ import someBy = require( '@stdlib/utils/some-by' );
 import someByRight = require( '@stdlib/utils/some-by-right' );
 import tabulate = require( '@stdlib/utils/tabulate' );
 import tabulateBy = require( '@stdlib/utils/tabulate-by' );
-import thunk = require( '@stdlib/utils/thunk' );
 import timeit = require( '@stdlib/utils/timeit' );
 import trycatch = require( '@stdlib/utils/try-catch' );
 import tryFunction = require( '@stdlib/utils/try-function' );
@@ -5401,27 +5400,6 @@ interface Namespace {
 	*/
 	tabulateBy: typeof tabulateBy;
 
-	/**
-	* Returns a thunk.
-	*
-	* @param fcn - function to convert to a thunk
-	* @param args - function args
-	* @returns thunk
-	*
-	* @example
-	* var add = require( '@stdlib/number/float64/base/add' );
-	*
-	* var f = ns.thunk( add, 2, 3 );
-	* // returns <Function>
-	*
-	* // ...
-	*
-	* // Evaluate the ns.thunk:
-	* var v = f();
-	* // returns 5
-	*/
-	thunk: typeof thunk;
-
 	/**
 	* Times a snippet.
 	*

lib/node_modules/@stdlib/utils/lib/index.js

@@ -1678,15 +1678,6 @@ setReadOnly( utils, 'tabulate', require( '@stdlib/utils/tabulate' ) );
 */
 setReadOnly( utils, 'tabulateBy', require( '@stdlib/utils/tabulate-by' ) );
 
-/**
-* @name thunk
-* @memberof utils
-* @readonly
-* @type {Function}
-* @see {@link module:@stdlib/utils/thunk}
-*/
-setReadOnly( utils, 'thunk', require( '@stdlib/utils/thunk' ) );
-
 /**
 * @name timeit
 * @memberof utils