Pre-made useful/suggested formatters?

[jagerber48]

sciform could provide a small repository of useful/suggested formatters. For example:

si_formatter = Formatter(
    exp_mode="engineering",
    round_mode="sig_fig",
    exp_format="prefix",
    superscript=True,
    paren_uncertainty=True,
    pdg_sig_figs=True,
)

Alternatively, instead of providing formatters, there could be utility functions that set the global default settings to the corresponding suggested options.