* Fix packages build
* Add support for boolean type in subgraph schema
* Add BigDecimal fromString and toString implementation
* Add implementation for subgraph Bytes type
* Implement enum type for subgraph schema
* Add implementation for subgraph schema BigDecimal type
* JSON stringify and parse entity data for auto-diff
* 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