[24.2] Add fastk_ktab_tar datatype required for fastk tool

[SaimMomin12]

This PR adds a new dataype called fastk_ktab_tar as advised by @bernt-matthias in galaxyproject/tools-iuc#6750

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• This is a refactoring of components with existing test coverage.
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[mvdbeek]

Do you need this to be tar ? Otherwise a directory subclass seems to make more sense ?

[bernt-matthias]

Do you need this to be tar ?

Good point. Seems that there is a directory that we tar and untar, before and after the tool runs, respectively.

Out of interest: the directory datatype is stored internally as a zip?