Add significant figures support to fmt_scientific() and vec_fmt_scientific()
#1411
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Previously,
fmt_number()andfmt_bytes()(and theirvec_fmt_*()analogues) had support for significant figures. This PR includes then_sigfigargument infmt_scientific(). This argument is compatible with thefrom_column()helper and so the use case where measurement precision varies by row (and should be reflected in the formatting of the value in scientific notation) can now be realized.