cortex update api to be compatible with pykern.api

[robnagler]

• Request: (api_name, api_args); Reply: (api_result or api_error)
• Rename to db.insertMaterialRaw/OrErr/API(?) tryInsertMaterial(?) which returns result or error
• Name without suffix throws api_error if returned.
• data.error is reserved for exceptions and handed by requestsender.js

[robnagler]

@moellep please comment on names

[moellep]

I'd rather have the caller on the javascript side pass an optional error handling callback than have a method suffix.
On the client, it could pass an error handler as a second arg:

const r = await requestSender.importFile(file, (err) => ...)
if (r) { // success
   ...
}

// or don't handle errors explicitly with same api
const r = await requestSender.importFile(file);
// r must be valid

If you don't pass an error handler, it gets thrown to a higher level, ex. not-found or forbidden.

[robnagler]

That's fine.