[CH] support customized file scan which does not support transform

[lhuang09287750]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
When we use customized file scan( not support transform ) , the output spark columnar format data cannot be passed to a transform supported exec directly.

Describe the solution you'd like
A columnar(spark) to columnar(backend native) plan ts needed between file scan and its transform supported parent

Describe alternatives you've considered
Otherwise we can use a step combined of C2R and R2C instead
For C2R and R2C are already implemented