Support other MergeTree table engine types

[Feder1co5oave]

Is there a reason why in AstVisitor.scala only MergeTree, in replicated and/or replacing variants, are supported?

I'm using a ReplicatedSummingMergeTree, it shouldn't be treated differently from a regular ReplicatedMergeTree, or am I missing something?

[pan3793]

I'm using a ReplicatedSummingMergeTree, it shouldn't be treated differently from a regular ReplicatedMergeTree

I think it's right for reading, but maybe not for writing.

This library original from a internal project, so there may lack some functionalities.

[pan3793]

@mzitnik this part still needs to improve.