feat: Add sal-net package to workspace

- Add new sal-net package to the workspace.
- Update MONOREPO_CONVERSION_PLAN.md to reflect the
  addition of the sal-net package and mark it as
  production-ready.
- Add Cargo.toml and README.md for the sal-net package.

Cargo.toml

@@ -11,7 +11,7 @@ categories = ["os", "filesystem", "api-bindings"]
 readme = "README.md"
 
 [workspace]
-members = [".", "vault", "git", "redisclient", "mycelium", "text", "os"]
+members = [".", "vault", "git", "redisclient", "mycelium", "text", "os", "net"]
 
 [dependencies]
 hex = "0.4"
@@ -65,6 +65,7 @@ sal-redisclient = { path = "redisclient" }
 sal-mycelium = { path = "mycelium" }
 sal-text = { path = "text" }
 sal-os = { path = "os" }
+sal-net = { path = "net" }
 
 # Optional features for specific OS functionality
 [target.'cfg(unix)'.dependencies]