feat: add publishing & audio to ffi (#46)

- Divide FFI protocol into multiple files
- Audio support
- AV Streams/Sources
- Create tracks
- Use Dashmap to store handles
- Add a capture test
     - Ignored by GHA atm

Cargo.lock

@@ -250,6 +250,19 @@ dependencies = [
  "syn 2.0.15",
 ]
 
+[[package]]
+name = "dashmap"
+version = "5.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "907076dfda823b0b36d2a1bb5f90c96660a5bbcd7729e10727f07858f22c4edc"
+dependencies = [
+ "cfg-if",
+ "hashbrown",
+ "lock_api",
+ "once_cell",
+ "parking_lot_core",
+]
+
 [[package]]
 name = "digest"
 version = "0.10.6"
@@ -794,10 +807,13 @@ dependencies = [
 name = "livekit-ffi"
 version = "0.1.1"
 dependencies = [
+ "dashmap",
  "futures-util",
  "lazy_static",
  "livekit",
+ "livekit-api",
  "livekit-protocol",
+ "log",
  "parking_lot",
  "prost",
  "prost-build",