fix: table sort for array of string and numbers

[jsCommander]

MatSort can't sort mixed array (string and numbers) correctly. I add
checking for compare number with string and now all numbers come first.

issue: 16303

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[andrewseguin]

Can you add some tests to make sure this behaves as expected?

[andrewseguin]

I opened a PR #18767 with a new test suite for the data source, once it's in you can add some tests for your code:

    it('should be able to correctly sort strings with numbers', () => {
      testSortWithValues(['0', '1', 'lemons', 'strawberries']);
    });

    it('should be able to correctly sort array with mix of strings and numbers', () => {
      testSortWithValues([0, 1, 'lemons', 'strawberries']);
    });

[jsCommander]

@andrewseguin, hi, thanks for reviewing my pull request.
Unfortunately, I deleted my pull request repository by mistake and i don't known how to fix it.
So I created new pull request #19109 with tests.

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