feat(tvix/nix-compat): enable more features by default

There's no point in not enabling these, and rust-analyzer is quite
useless too.

nix-compat users outside of here can still explicitly disable default
features if they don't want to pull in these features.

Change-Id: I8f2f24e7734ad152d1733bc3421098fc91af290a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11455
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: picnoir picnoir <picnoir@alternativebit.fr>

tvix/nix-compat/Cargo.toml

@@ -9,6 +9,9 @@ async = ["tokio"]
 # code emitting low-level packets used in the daemon protocol.
 wire = ["tokio", "pin-project-lite"]
 
+# Enable all features by default.
+default = ["async", "wire"]
+
 [dependencies]
 bitflags = "2.4.1"
 bstr = { version = "1.6.0", features = ["alloc", "unicode", "serde"] }