Add support for BEP028 provenance record(s)

[yarikoptic]

• [ENH][BEP028] Specification update for BEP028 BIDS-Prov bids-standard/bids-specification#2099

introduces W3C PROV based provenance tracking to BIDS. nwb2bids is a perfect candidate to add support to so we could demonstrate on converted datasets how it would look in that spec.