Programmable Sources

[blt]

As of now all sources must be written in Rust. This is a significant limitation for operation teams. While it is possible to write filters in lua there's no such similar facility for sources. There ought to be.

To make this possible we'd need to expose the following into lua (at a minimum):

• TCP recv
• UDP recv
• HTTP recv

Each of these is a project in itself. A motivating source would be suitable here.