implement span apis, tti log and update Capture

[snowp]

@jacksonhardaker I'll probably need your help to figure out how to a) get tests working and b) figure out how to share this JS-based span implementation between RN and Electron, since it seems like we should be able to use this in both places if we can abstract out the actual log call somehow and c) how to get tests working

[jacksonhardaker]

Was going to say we could probably use crypto.randomUUID() instead, but I don't think react native supports that.

[jacksonhardaker]

nit: Pull this out of the function scope as a const so it doesn't need to be initialized every time the function is called.

[jacksonhardaker]

Suggested change

	let start_span_fields = {
	let startSpanFields = {

[jacksonhardaker]

Regarding sharing between electron/react-native:

The "proper" way to do it would be to publish a new npm package. Honestly, @bitdrift/core would be a better name for this, but since that's taken maybe something dumb like @bitdrift/shared.

It goes against the nx philosophy, but there might be a way we can hack together having a shared lib in a distinct nx lib, and bundle it at build time with react-native/electron. I can play around with this if you like.

Regardless of which way we go about it, I'd have the "shared" library just expose functions using a factory pattern so that the log function can be abstracted i.e.

const buildStartSpan = (log: LogFunction) => ( 
  name: string,
  level: LogLevel,
  fields?: SerializableLogFields,
  startTimeInterval?: number,
  parentSpanID?: string,) => { ... }