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/ArgumentCompilerStub.ts

@@ -0,0 +1,37 @@
+import { FunctionCallCompilationContext } from '@/application/Parser/Script/Compiler/Function/Call/Compiler/FunctionCallCompilationContext';
+import { ArgumentCompiler } from '@/application/Parser/Script/Compiler/Function/Call/Compiler/SingleCall/Strategies/Argument/ArgumentCompiler';
+import { FunctionCall } from '@/application/Parser/Script/Compiler/Function/Call/FunctionCall';
+import { FunctionCallStub } from './FunctionCallStub';
+import { StubWithObservableMethodCalls } from './StubWithObservableMethodCalls';
+
+export class ArgumentCompilerStub
+  extends StubWithObservableMethodCalls<ArgumentCompiler>
+  implements ArgumentCompiler {
+  private readonly scenarios = new Array<ArgumentCompilationScenario>();
+
+  public createCompiledNestedCall(
+    nestedFunctionCall: FunctionCall,
+    parentFunctionCall: FunctionCall,
+    context: FunctionCallCompilationContext,
+  ): FunctionCall {
+    this.registerMethodCall({
+      methodName: 'createCompiledNestedCall',
+      args: [nestedFunctionCall, parentFunctionCall, context],
+    });
+    const scenario = this.scenarios.find((s) => s.givenNestedFunctionCall === nestedFunctionCall);
+    if (scenario) {
+      return scenario.result;
+    }
+    return new FunctionCallStub();
+  }
+
+  public withScenario(scenario: ArgumentCompilationScenario): this {
+    this.scenarios.push(scenario);
+    return this;
+  }
+}
+
+interface ArgumentCompilationScenario {
+  readonly givenNestedFunctionCall: FunctionCall;
+  readonly result: FunctionCall;
+}