Python integration

[calumrussell]

• Build working PoC with no data movement between Rust and Python
• Build working PoC with data movement between Rust and Python
• Create zero-copy data structures in DataSource that can be passed between Rust and Python, and test in PoC
• Add WASM example build (code for this is in antevorta already).

Longer-term goal is to have trading strategy written in Python running in Rust. I am not sure if this is possible but looking at - https://github.com/pola-rs/polars.

[calumrussell]

Generic DataSource has been hardcoded into all dependants, this will have to be changed at some point but wasn't worth doing now as it would require substantial changes to signatures for almost everything.

[calumrussell]

Not working correctly but appears to be zero-copy.

[calumrussell]

No time for JS integration.