Normalization not applied to BIOMV210Format files on import

[thermokarst]

Comments
This is because importing data that share the same artifact_format as the semantic type enjoy transformerless-imports. While this is generally a convenience for developers, it makes things a pain when we need to apply additional transforms (see: feature table munging in this plugin, which strips out biom metadata, among other things). Not sure if this needs to be solved more generally in the framework, or if we can just define a BIOMV210Format -> BIOMV210Format transformer here.

References
This issue came up on the forum.