Make tableHeader and tableCell write empty attrs map / table parser to add default attributes

[Craig Lawrence]

We have a repeat of the codeBlock problem:
https://bitbucket.org/atlassian/adf-builder-java/issues/29/make-codeblock-write-empty-attrs-map
https://bitbucket.org/atlassian/adf-builder-java/pull-requests/32

These node types produce empty attrs when converted to ADF using the Typescript transformer:

We also see a repeat of the ListBuilder.OMIT_ORDER problem where default attributes are added by the Typescript transformer, so replicate this behind a similar parser FF.

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[Chris Fuller]

Fixed in 0.24.4