Removing dependence on inspect

[HannanNaeem]

This PR removes dependence on inspect library for type inference pipeline. This restructure includes:

• Reading of types now happens in the runtime object in runtime.py using the parser.
• This means that the parser is now initialized first in runtime.py using the compiler object already available
• Original parameters and their annotation are now read from the workunit AST itself.
• Runtime object now has a cache for the original state of the arguments node in the AST (to reset the arguments for the next call to the workunit)

[NaderAlAwar]

Looks good so far. I might have more comments when you move the code from runtime

[NaderAlAwar]

Looks good, thanks!