fix(material/table): Sorting of a string column/property breaks if one record contains a number only

[sahilmore-git]

fix(material/table): Sorting of a string column/property breaks if one record contains a number only

If the number is a string and in between strings we treat it as a number and group it at the start/end of the table based on it's ascending or descending. I have fixed the issue in my commit here and I think it will work properly.

Fixes #20140

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[sahilmore-git]

@googlebot I fixed it.

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We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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