Hook up LLDB debugger backend on linux

[mdsitton]

With this the new lldb backend atleast works in linux now.

[bfiete]

This appears to break macOS:

In file included from /Users/runner/work/Beef/Beef/IDEHelper/LinuxDebugger.cpp:2:
/Users/runner/work/Beef/Beef/IDEHelper/LinuxDebugger.h:3:1: error: unknown type name 'NS_BF_DBG_BEGIN'
    3 | NS_BF_DBG_BEGIN
      | ^
/Users/runner/work/Beef/Beef/IDEHelper/LinuxDebugger.h:8:14: error: expected ';' after top level declarator
    8 | NS_BF_DBG_END
      |              ^
      |              ;
/Users/runner/work/Beef/Beef/IDEHelper/LinuxDebugger.cpp:12:1: error: a type specifier is required for all declarations
   12 | USING_NS_BF_DBG;
      | ^
3 errors generated.

[bfiete]

Also I don't think there's a specific reason you needed to introduce a LinuxDebugger.cpp/h, I think it probably would have been best just to put it inside LLDBDebugger but put a conditional '#idef !defined BF_PLATFORM_WINDOWS` around it since that's the only exception to when you would want that code if LLDB_ENABLED were defined.

[bfiete]

Oh right there already was a LinuxDebugger. I would suggest deleting that, actually.