WIP: experiemental implementation of heterogeneous dynamic table type

[iblislin]

Ref #482 (comment)

[codecov-commenter]

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❗ No coverage uploaded for pull request base (v0.30@15c3bd7). Click here to learn what that means.
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@@           Coverage Diff            @@
##             v0.30     #494   +/-   ##
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  Coverage         ?   77.13%           
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  Files            ?       19           
  Lines            ?      831           
  Branches         ?        0           
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  Hits             ?      641           
  Misses           ?      190           
  Partials         ?        0           

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