* Implement host api for bigint operations
* Implement type conversion APIs
* Avoid use of exports as variable name for conflict
* Implement log API with debug and levels
* Fix job-runnner hook error after stopping and starting chain
* Code for running wasm file.
* Add test for wasm exported function.
* Use target names for build files.
Co-authored-by: nabarun <nabarun@deepstacksoft.com>