Lambda functions and operations cannot be used from IQ#.

[cgranade]

Describe the bug
New lambda functions and operations (e.g.: (x) -> x) cannot currently be compiled using IQ#.

To Reproduce

Steps to reproduce the behavior:

1. From a Python + Q# notebook, run import qsharp, and then run the cell:

   %%qsharp
   function Foo() : Unit {
       let f = x -> x;
       let y = f(12);
   }

2. Observe error:

   : error IQS002: Unexpected error compiling assembly: Can't generate code for un-lifted lambda..
   ---------------------------------------------------------------------------
   TypeError                                 Traceback (most recent call last)
   ~\AppData\Local\Temp/ipykernel_35408/4074425879.py in <module>
   ----> 1 get_ipython().run_cell_magic('qsharp', '', 'function Foo() : Unit {\n    let f = x -> x;\n    
   let y = f(12);\n}\n')
   
   ~\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py in run_cell_magic(self, magic_name, line, cell)
      2417             with self.builtin_trap:
      2418                 args = (magic_arg_s, cell)
   -> 2419                 result = fn(*args, **kwargs)
      2420             return result
      2421 
   
   ~\Anaconda3\lib\site-packages\qsharp\ipython_magic.py in qsharp(magic_args, cell, local_ns)
        26             local_ns[callables._name] = callables
        27         else:
   ---> 28             for qs_callable in callables:
        29                 local_ns[qs_callable._name] = qs_callable
        30 
   
   TypeError: 'NoneType' object is not iterable
   

Expected behavior
The above snippet should either compile correctly or fail with a clear and actionable error message.

Screenshots

System information

In []: qsharp.component_versions()
Out[]: {'iqsharp': LooseVersion ('0.23.195983'),
 'Jupyter Core': LooseVersion ('1.5.0.0'),
 '.NET Runtime': LooseVersion ('.NETCoreApp,Version=v3.1'),
 'qsharp': LooseVersion ('0.23.195983')}

Additional context

SamarSha has shared that the root cause may be the default value of the CompilationLoader.Configuration.LiftLambdaFunctions property as implicitly used at:

iqsharp/src/Core/Compiler/CompilerService.cs

Line 138 in b22c34d

var loadOptions = new CompilationLoader.Configuration