First release containing auth

This this the first release containing support for the draft auth proposal. These features are still WIP - so be warned there might be breaking changes in the future.

What's Changed

• Client implementation of MCP auth by @jspahrsummers in #144
• Update esbuild to resolve security advisory by @jspahrsummers in #154
• fix: drop unresolved union members in zod schemas by @disintegrator in #150
• Server implementation of MCP auth by @jspahrsummers in #151

New Contributors

• @disintegrator made their first contribution in #150

Full Changelog: 1.5.0...1.6.0