Release v0.5.0

Pyfive v0.5.0 release

Closes #75

Main highlights:

• Functionality enhancements to address lazy loading of chunked data, variable length strings, and other minor bug fixes: a completely new approach to handling thread-safe loading of HDF5 files by @bnlawrence and @davidhassell in #68
• Various improvements towards the pyfive Python package by @valeriupredoi #69 #72 #73 #74 #76 #79

Notes:

• the repository has now moved permanently to NCAS-CMS https://github.com/NCAS-CMS and will be maintained by NCAS-CMS
• a release cycle will be set up in the future, for now we are releasing on a "whim" ie when major updates are merged in main

Special thanks:

• many thanks to @jjhelmus for all his help passing the Pyfive baton
• many thanks to @kmuehlbauer for willing to help out here

🍻