build: switch to smooth-operator branch and vendor the java-properties writer

Patches operator-rs to the smooth-operator branch (matching trino/hdfs) as the
foundation for the v2 config_overrides adoption later in this series, and
vendors the Java-properties writer into config/writer (backed by the
java-properties crate, Apache-2.0) so ConfigMap rendering no longer goes through
product_config::writer. Repointed resource/configmap.rs. No behaviour change
(18 tests pass). Regenerated Cargo.nix/crate-hashes.json.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: adwk67

Cargo.lock

@@ -19,6 +19,7 @@ clap = "4.5"
 const_format = "0.2"
 futures = "0.3"
 indoc = "2.0"
+java-properties = "2.0"
 rstest = "0.26"
 semver = "1.0"
 serde = { version = "1.0", features = ["derive"] }
@@ -30,5 +31,6 @@ tokio = { version = "1.40", features = ["full"] }
 tracing = "0.1"
 
 [patch."https://github.com/stackabletech/operator-rs.git"]
+stackable-operator = { git = "https://github.com/stackabletech//operator-rs.git", branch = "smooth-operator" }
 # stackable-operator = { path = "../operator-rs/crates/stackable-operator" }
 # stackable-operator = { git = "https://github.com/stackabletech//operator-rs.git", branch = "main" }

Cargo.nix

@@ -13,6 +13,7 @@ product-config.workspace = true
 stackable-operator.workspace = true
 
 indoc.workspace = true
+java-properties.workspace = true
 anyhow.workspace = true
 clap.workspace = true
 const_format.workspace = true

Cargo.toml

@@ -1,3 +1,4 @@
 pub mod command;
 pub mod jvm;
 pub mod node_id_hasher;
+pub mod writer;