[lldb/Python] Add lldbconfig module to make the lldb module configurable

Using the approach suggested by Pavel in D77588, this patch introduces a
new lldbconfig module that lives next to the lldb module. It makes it
possible to make the lldb module configurable before importing it. More
specifically it makes it possible to delay initializing the debugger,
which is needed for testing the reproducer.

Differential revision: https://reviews.llvm.org/D77661

lldb/bindings/python.swig

@@ -128,8 +128,15 @@ using namespace lldb;
 %include "./python/python-wrapper.swig"
 
 %pythoncode%{
+_initialize = True
+try:
+   import lldbconfig
+   _initialize = lldbconfig.INITIALIZE
+except ImportError:
+   pass
 debugger_unique_id = 0
-SBDebugger.Initialize()
+if _initialize:
+   SBDebugger.Initialize()
 debugger = None
 target = None
 process = None

lldb/packages/Python/lldbconfig/__init__.py

@@ -0,0 +1 @@
+INITIALIZE = True

lldb/packages/Python/lldbsuite/test/dotest.py

@@ -954,7 +954,9 @@ def run_suite():
 
     setupSysPath()
 
+    import lldbconfig
     import lldb
+
     # Use host platform by default.
     lldb.selected_platform = lldb.SBPlatform.GetHostPlatform()