feat(component): add KV capability probe

Add a small Component that imports wasmeld:kv/store@0.1.0 and exercises get, set, and delete through a byte-oriented test protocol.

Pin service and KV WIT dependencies in wit.lock while keeping generated wit/deps content out of source control.

components/kv-probe/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "kv-probe-component"
+version = "0.1.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+
+[package.metadata.wasmeld]
+id = "kv-probe"
+world = "component:kv-probe/kv-probe-component@0.1.0"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wit-bindgen.workspace = true