* Invoke handlers based on watcher-ts events
* Read subgraph yaml and listen to events from watcher-ts
* Create GraphWatcher class to use in generated example contract watcher
* Call graph-node event handler from generated watcher
* Perform eth_call and get result in js import
* Use dummy value for eth_call
* Called handler in wasm with event param
* Implement passing event to subgraph handler function
* Use generated event class Test for passing to handler
* Pass event params to handler
Co-authored-by: nabarun <nabarun@deepstacksoft.com>
