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.

tests/unit/shared/Stubs/FunctionCallCompilationContextStub.ts

@@ -0,0 +1,27 @@
+import { FunctionCallCompilationContext } from '@/application/Parser/Script/Compiler/Function/Call/Compiler/FunctionCallCompilationContext';
+import { SingleCallCompiler } from '@/application/Parser/Script/Compiler/Function/Call/Compiler/SingleCall/SingleCallCompiler';
+import { FunctionCall } from '@/application/Parser/Script/Compiler/Function/Call/FunctionCall';
+import { ISharedFunctionCollection } from '@/application/Parser/Script/Compiler/Function/ISharedFunctionCollection';
+import { SingleCallCompilerStub } from './SingleCallCompilerStub';
+import { FunctionCallStub } from './FunctionCallStub';
+import { SharedFunctionCollectionStub } from './SharedFunctionCollectionStub';
+
+export class FunctionCallCompilationContextStub implements FunctionCallCompilationContext {
+  public allFunctions: ISharedFunctionCollection = new SharedFunctionCollectionStub();
+
+  public rootCallSequence: readonly FunctionCall[] = [
+    new FunctionCallStub(), new FunctionCallStub(),
+  ];
+
+  public singleCallCompiler: SingleCallCompiler = new SingleCallCompilerStub();
+
+  public withSingleCallCompiler(singleCallCompiler: SingleCallCompiler): this {
+    this.singleCallCompiler = singleCallCompiler;
+    return this;
+  }
+
+  public withAllFunctions(allFunctions: ISharedFunctionCollection): this {
+    this.allFunctions = allFunctions;
+    return this;
+  }
+}