Compile schemas for Cap'n'Proto and Flatbuffers

src/marketdata_custom.rs

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+// This is hand-written code to act as proof-of-concept
+// for a more complex schema generator. Theoretically, the
+// schema file that would be used to generate the code below
+// looks something like this (influenced by Kaitai Struct):
+//
+// seq:
+//   - id: ts_nanos
+//     type: u64
+//   - id: symbol
+//     type: str
+//   - id: msg_type
+//     type: u8
+//     enum: msg_type
+//   - id: msg_body
+//     type:
+//       switch-on: msg_type
+//       cases:
+//         msg_type::trade: trade
+//         msg_type::level_update: level_update
+// enums:
+//   msg_type:
+//     0: trade
+//     1: level_update
+//
+//   side:
+//     0: buy
+//     1: sell
+//
+// types:
+//   trade:
+//     seq:
+//       - id: price
+//         type: u64
+//       - id: size
+//         type: u32
+//   level_update:
+//     seq:
+//       - id: price
+//         type: u64
+//       - id: size
+//         type: u32
+//       - id: flags
+//         type: u8
+//       - id: side
+//         type: u8
+//         enum: side