store() enhancement: ... management

[pearsonca]

It is desirable to support having a regularized invocation of store() - i.e. to have a script that generates the same kind of thing (e.g. a data.table) which might get stored to different formats (e.g. csv or rds). Other examples: plot to various image file formats or even an rds for later composition with other plots.

Rather than having the user troubleshoot which arguments to pass by target file type, desire to have them provide all the arguments in ... for whatever storage targets they want to support, and have function internally strip out unnecessary arguments.

One potential issue is overlapping arguments with different meanings, but burn that bridge when I get to it.