load modules

[krichprollsch]

• depends on expose c string zig-v8-fork#31
• depends on expose Isolate.SetData and Isolate.GetData zig-v8-fork#34

The lib expects the client implements a function to fetch and compile the modules.
This function must be registered with setModuleLoadFn (maybe `registerModuleLoadFn1 would be a better name 🤔 ).

Example of client implementation in lightpanda-io/browser@48e7c8a