feat(android): implement private Rust storage runtime (#90)

crates/storage/Cargo.toml

@@ -30,6 +30,7 @@ full = [
     "dep:regex",
     "dep:reqwest",
     "dep:rustls",
+    "dep:rustix",
     "dep:rqrr",
     "dep:secret-service",
     "dep:security-framework",
@@ -46,6 +47,7 @@ watch = []
 [dependencies]
 cap-std = { workspace = true, optional = true }
 cap-tempfile = { workspace = true, optional = true }
+rustix = { workspace = true, optional = true }
 clap = { workspace = true, optional = true }
 clap_complete = { workspace = true, optional = true }
 data-encoding.workspace = true