Add documentation comments for TypeScript SDK

[radu-matei]

ref https://tsdoc.org/

[karthik2804]

There are some issues with this because of the way the SDK is setup. typedoc spits out only the documentation for the exported items which in our case is a very small subset of the API (4 interfaces recalling from memory). I need to look into the plugin ecosystem to see if I can find something that we can use to export all the required interfaces. if not we may need to write our own plugin or build on top of tsdoc.

[karthik2804]

The new SDK comes with tsdoc and the docs are published to https:/fermyon.github.io/spin-js-sdk
the v1 SDK docs can be found at https:/fermyon.github.io/spin-js-sdk/v1