Core: add FanoutEqualityDeleteWriter and FanoutPositionDeleteWriter

[dungdm93]

Inspire from ClusteredPositionDeleteWriter and ClusteredEqualityDeleteWriter, this PR add 2 FanoutWriter that write delete files which could be used in streaming (e.g Flink)

Signed-off-by: Đặng Minh Dũng dungdm93@live.com

[dungdm93]

cc @aokolnychyi

[rdblue]

@dungdm93, are these needed? You said they "could be used" but we don't want to add classes unless they are actually going to be used by some engine.

[pvary]

@rdblue: Not sure about the FanoutEqualityDeleteWriter, but we are thinking about implementing deletes for low cardinality tables. FanoutPositionDeleteWriter might be useful there. Would that make sense there? That said we are only in the "scratching the surface" phase, so we might go into another direction when we start seriously working on it.

[dungdm93]

@rdblue @pvary actually, it's a part of #4132, let's go there for the discussion.

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