feature/desktop app

[whitphx]

For #69

[whitphx]

We should switch to develop snapshotting.

• Hack to bundle and load the wheels at the local FS (cc187a1) will be unnecessary
• All dependencies will be bundled so that the app can bootstrap offline.

For snapshotting,

Saving phase

1. Run the bootstrap phase
2. Save /home/pyodide and /lib/python3.10/site-packages into files

Restoring and execution phase

1. Restore the directories from the snapshot files
2. Skip the normal bootstrap phase
3. Run Streamlit process as usual

To do so,
1. Extract the bootstrap code in worker.ts into a reusable function
2. Convert @stlite/stlite-kernel module into a dual module for ESM and CJS so that we can use the bootstrap function on NodeJS
3. Implement the snapshotting.
To do so, at first, there would be duplicate code of bootstrapping in the kernel and desktop directories. One for runtime, one for snapshotting at build time.