feat: Add support for virt package

- Add sal-virt package to the workspace members
- Update MONOREPO_CONVERSION_PLAN.md to reflect the
  completion of sal-process and sal-virt packages
- Update src/lib.rs to include sal-virt
- Update src/postgresclient to use sal-virt instead of local
  virt module
- Update tests to use sal-virt

virt/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "sal-virt"
+version = "0.1.0"
+edition = "2021"
+authors = ["PlanetFirst <info@incubaid.com>"]
+description = "SAL Virt - Virtualization and containerization tools including Buildah, Nerdctl, and RFS"
+repository = "https://git.threefold.info/herocode/sal"
+license = "Apache-2.0"
+
+[dependencies]
+# Core dependencies
+anyhow = "1.0.98"
+tempfile = "3.5"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+rhai = { version = "1.12.0", features = ["sync"] }
+
+# SAL dependencies
+sal-process = { path = "../process" }
+sal-os = { path = "../os" }
+
+[dev-dependencies]
+tempfile = "3.5"
+lazy_static = "1.4.0"