Determine whether to execute a custom transformer according to the types of SRC and DST

[kooksee]

I will define some models, and I will also use protobuf. Sometimes their field types are different, so I want to customize the transformer according to the types of SRC and DST

1. For example, int64 and timestamppb Timestamp
2. A simple idea

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[darccio]

@kooksee I see the value of this idea. I'm marking it as candidate for v2.

[darccio]

Looks like #198 could be a good starting point for this in v2.