Jco transpile: implementation of wasi-http for Web

[pchickey]

Targets ServiceWorker, Fetch.

Tasks

• incoming-handler.handle
• outgoing-handler.handle
• types.drop-fields
• types.new-fields
• types.fields-get
• types.fields-set
• types.fields-delete
• types.fields-append
• types.fields-entries
• types.fields-clone
• types.finish-incoming-stream
• types.finish-outgoing-stream
• types.drop-incoming-request
• types.drop-outgoing-request
• types.incoming-request-method
• types.incoming-request-path-with-query
• types.incoming-request-scheme
• types.incoming-request-authority
• types.incoming-request-headers
• types.incoming-request-consume
• types.new-outgoing-request
• types.outgoing-request-write
• types.drop-response-outparam
• types.set-response-outparam
• types.drop-incoming-response
• types.incoming-response-status
• types.incoming-response-headers
• types.incoming-response-consume
• types.drop-outgoing-response
• types.new-outgoing-response
• types.outgoing-response-write
• types.future-incoming-response-get
• types.drop-future-incoming-response
• types.listen-to-future-incoming-response