Fix issue when pulling from cells with some types of formulas is them

[IsakNaslundBh]

Issues addressed by this PR

Closes #22

As stated in the issue, there are some issues with reading values from some cells that contain some types of formulas.

The code in this PR fixes the issue by falling back to the cached value of the cell for when getting the Value out fails.
I went with raising a warning if this happens, and if closedXML believes the cell needs recalculation. For all cases I have tested so far, the cached value will be correct, but raised the warning to be safe.

Saying that, I was not aware that the adapter actually recomputed the sheet to get the values. Would have assumed that it just got whatever was in the cell, so might be safe to remove the warning.
Happy for any input on this from reviewers.

Test files

https://burohappold.sharepoint.com/:f:/r/sites/BHoM/02_Current/12_Scripts/02_Pull%20Request/BHoM/Excel_Toolkit/%2323-FixIssueReadingSheetsWithSomeTypesOfForumlas?csf=1&web=1&e=7dFRFj

Changelog

Additional comments

[IsakNaslundBh]

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[FraserGreenroyd]

Testing against today's alpha using the test script provided shows these two errors on the canvas:

After rebasing this PR and compiling this toolkit, the errors change to warnings:

Same for both pulls.

This did pull through values whereas the alpha did not, so this PR represents an improvement to the overall workflow. I'm happy for this to be merged and deployed for further testing via alphas.

[FraserGreenroyd]

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