Fix CZI Physical Pixel Sizes

This is a quick patch put in by @emay2022 to fix CZI physical pixel sizes. Users of AICSImageIO may notice that their CZI physical pixel sizes have changed after upgrading but we believe them to be accurate now as the original implmentation of parsing the CZI metadata was string based and not float calculation / unit conversion based.

What's Changed

• bugfix/czi-physical-size by @emay2022 in #384

Contributors and Reviewers this Release

• @emay2022
• @ianhi
• @toloudis
• @JacksonMaxfield

Full Changelog: v4.6.0...v4.6.1