[Feature Request] Allow conversion to columns other than hgnc symbol

[Nelson-Gon]

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Hello,

I was looking at setReadable and was happy to note that this exists and works well for conversion to gene symbols. I think sometimes it may be necessary to convert to an ensembl ID instead and it would be great if there were support for this.

Looking at https://github.com/YuLab-SMU/DOSE/blob/20c57bc217fa9aa17dc642ec047bd80a1848efe5/R/setReadable.R#L53, it seems EXTID2NAME only currently does keytype -> gene symbol conversion.

I envision this would consist of a switch and perhaps an extra argument requesting for the target conversion.

Thank you,

NelsonGon