v2.0.0-alpha.0

• Support for a new Date and Display String types, from the new draft draft-ietf-httpbis-sfbis.
• Simplified serializing Dictionaries and Items. The existing signatures still work, but the new API is a bit more natural and doesn't require wrapping everything in arrays and Maps.
• Now requires Node 18.
• Converted to ESM.
• No longer providing a Webpack build. Most frontend applications already do their own bundling. Please let us know if you need this, so we can redo this with modern tools.