Refactor gguf scripts to improve metadata handling (#11909)
* Refactor gguf scripts to improve metadata handling
Added contents method to ReaderField class
Added endianess property to GGUFReader class
* update scripts
* fix import
* remove unused import
* attempt to work around flake and pyright errors
* second attempt
* give up, ignore type
* bump version
* apply newbyteorder fixes
