ENH: Add new action that can normalize FeatureTable[Frequency] with different methods.

[VinzentRisch]

The action annotate-reads-card generates a FeatureTable[Frequency] table. These tables contain the raw information of how many reads were mapped to a certain ARG in CARD. To make meaningful comparisons in and across samples, this information has to be normalized to gene length, library size and composition.

To achieve this, a new action has to be created that can normalize feature tables with current standard methods.
The integration will be done with RNAnorm. A python package that is used for RNAseq normalizations and provides multiple methods like CPM, TPM , FPKM, TMM , CTF, UQ and CUF.

[VinzentRisch]

moved to q2-feature-table
qiime2/q2-feature-table#311