feat(tvix/nar-bridge): implement range request for NARs

With an implementation of AsyncRead + AsyncSeek, axum-range can answer
range requests.

We only use it if a range has been requested, as it uses more memory
than the linear variant.

Change-Id: I0072b0a09b328f3e932f14567a2caa3a49abcbf7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12509
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Reviewed-by: yuka <yuka@yuka.dev>

tvix/nar-bridge/Cargo.toml

@@ -5,6 +5,8 @@ edition = "2021"
 
 [dependencies]
 axum = { workspace = true, features = ["http2"] }
+axum-extra = { workspace = true }
+axum-range = { workspace = true }
 tower = { workspace = true }
 tower-http = { workspace = true, features = ["trace"] }
 bytes = { workspace = true }