feat: Implement half-duplex streaming (#38)

Implements streaming the CAR file that's generated in a response and consuming a response CAR stream.

This is not doing full-duplex streaming yet, but the difference shouldn't be too big.

This has helped cold sync in appa a lot, since it reduces the amount of round-trips to one and streams all bytes needed for sync in one go.

---

* feat: Implement streaming

* fix: Good 'ol 1-character bug

* chore: Switch tests to use `TestResult` and `test_log`

* feat: Add useful trace msgs

* refactor: Re-use streaming impl for non-streaming impl

* chore: Write docs

car-mirror/Cargo.toml

@@ -24,7 +24,6 @@ doc = true
 
 [dependencies]
 anyhow = "1.0"
-async-stream = "0.3.5"
 async-trait = "0.1.73"
 bytes = "1.4"
 deterministic-bloom = "0.1"
@@ -40,16 +39,17 @@ serde_ipld_dagcbor = "0.4"
 thiserror = "1.0"
 tokio = { version = "^1", default-features = false }
 tracing = "0.1"
-tracing-subscriber = "0.3"
 wnfs-common = "0.1.26"
 
 [dev-dependencies]
 async-std = { version = "1.11", features = ["attributes"] }
 car-mirror = { path = ".", features = ["test_utils"] }
 proptest = "1.1"
 roaring-graphs = "0.12"
+test-log = { version = "0.2", default-features = false, features = ["trace"] }
 test-strategy = "0.3"
-testresult = "0.3.0"
+testresult = "0.3"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "json", "parking_lot", "registry"] }
 
 [features]
 default = []