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/SingleCallCompilerStub.ts

@@ -0,0 +1,47 @@
+import { CompiledCode } from '@/application/Parser/Script/Compiler/Function/Call/Compiler/CompiledCode';
+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 { StubWithObservableMethodCalls } from './StubWithObservableMethodCalls';
+import { CompiledCodeStub } from './CompiledCodeStub';
+
+interface CallCompilationScenario {
+  readonly givenCall: FunctionCall;
+  readonly result: CompiledCode[];
+}
+
+export class SingleCallCompilerStub
+  extends StubWithObservableMethodCalls<SingleCallCompiler>
+  implements SingleCallCompiler {
+  private readonly callCompilationScenarios = new Array<CallCompilationScenario>();
+
+  public withCallCompilationScenarios(scenarios: Map<FunctionCall, CompiledCode[]>): this {
+    for (const [call, result] of scenarios) {
+      this.withCallCompilationScenario({
+        givenCall: call,
+        result,
+      });
+    }
+    return this;
+  }
+
+  public withCallCompilationScenario(scenario: CallCompilationScenario): this {
+    this.callCompilationScenarios.push(scenario);
+    return this;
+  }
+
+  public compileSingleCall(
+    call: FunctionCall,
+    context: FunctionCallCompilationContext,
+  ): CompiledCode[] {
+    this.registerMethodCall({
+      methodName: 'compileSingleCall',
+      args: [call, context],
+    });
+    const callCompilation = this.callCompilationScenarios.find((s) => s.givenCall === call);
+    if (callCompilation) {
+      return callCompilation.result;
+    }
+    return [new CompiledCodeStub()];
+  }
+}