Fix compiler bug with nested optional arguments

This commit fixes compiler bug where it fails when optional values are
compiled into absent values in nested calls.

- Throw exception with more context for easier future debugging.
- Add better validation of argument values for nested calls.
- Refactor `FunctionCallCompiler` for better clarity and modularize it
  to make it more maintainable and testable.
- Refactor related interface to not have `I` prefix, and
  function/variable names for better clarity.

Context:

Discovered this issue while attempting to call
`RunInlineCodeAsTrustedInstaller` which in turn invokes `RunPowerShell`
for issue #246. This led to the realization that despite parameters
flagged as optional, the nested argument compilation didn't support
them.

src/application/Parser/Script/Compiler/Function/ISharedFunctionCollection.ts

@@ -2,4 +2,5 @@ import { ISharedFunction } from './ISharedFunction';
 
 export interface ISharedFunctionCollection {
   getFunctionByName(name: string): ISharedFunction;
+  getRequiredParameterNames(functionName: string): string[];
 }