[Content fidelity] Support cellPadding and cellSpacing attributes in Content Model

[BryanValverdeU]

Add support to cellpadding and cellspacing attributes in Content model, in order to improve content fidelity when writing back tables with these attributes.

Before	After

To test:

1. Restore the below Snapshot
2. trigger content model write back
3. Expect that the table remains the same

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