feat: Add CI/CD workflows for testing and publishing SAL crates

- Add a workflow for testing the publishing setup
- Add a workflow for publishing SAL crates to crates.io
- Improve crate metadata and version management
- Add optional dependencies for modularity
- Improve documentation for publishing and usage

postgresclient/README.md

@@ -1,7 +1,16 @@
-# SAL PostgreSQL Client
+# SAL PostgreSQL Client (`sal-postgresclient`)
 
 The SAL PostgreSQL Client (`sal-postgresclient`) is an independent package that provides a simple and efficient way to interact with PostgreSQL databases in Rust. It offers connection management, query execution, a builder pattern for flexible configuration, and PostgreSQL installer functionality using nerdctl.
 
+## Installation
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+sal-postgresclient = "0.1.0"
+```
+
 ## Features
 
 - **Connection Management**: Automatic connection handling and reconnection