OpenXML Filter: XLSX: expose numbers, dates and booleans as metadata

This is a follow-up to issue #1062 (closed).

We are extracting inline (issue #982 (closed)) and shared strings as metadata. And it would be reasonable to have numbers, dates and booleans extracted as well.

Below is a sample document for references:

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And here are some peculiarities of it:

1. Number

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2. Boolean

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3. Date

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4. Date-time

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5. Number function

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6. String function

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For more details please refer to the attached document.