Move @azure-tools/typespec-client-generator-core to devDependencies and bump to ~0.59.0 to fix npm ERESOLVE#605

ShivangiReja wants to merge 1 commit intoopenai:mainopenai/openai-dotnet:mainfrom

ShivangiReja:shreja/GeneratorUpdate_FixCoreVersionShivangiReja/openai-dotnet:shreja/GeneratorUpdate_FixCoreVersionCopy head branch name to clipboard