add support for `jModulesInfo` packet

[andrurogerz]

DS2 does not support the jModulesInfo packet documented here. The TestGdbRemoteModuleInfo.test_module_info_llgs lldb test case fails as a result.

From the lldb packet documentation:

Get information for a list of modules by given module path and architecture.
The response is a JSON array of dictionaries containing the following keys:
uuid
triple
file_path
file_offset
file_size

The meaning of the fields is the same as in the qModuleInfo packet. The server signals the failure to retrieve the module info for a file by ommiting the corresponding array entry from the response. The server may also include entries the client did not ask for, if it has reason to the modules will be interesting to the client.