feat: Adds config files and management to CLI

This adds basic configuration for the things we already have. In a follow
up I'll add support for OCI credentials and allowed repositories

Closes #34

Signed-off-by: Taylor Thomas <taylor@oftaylor.com>

Author: thomastaylor312

Cargo.lock

@@ -44,6 +44,8 @@ wasmtime-wasi-config = "33"
 [dependencies]
 anyhow = { workspace = true }
 clap = { version = "4.5", features = ["derive"] }
+etcetera = { workspace = true }
+figment = { version = "0.10", features = ["env", "toml"] }
 wassette = { workspace = true }
 mcp-server = { workspace = true }
 oci-client = { workspace = true }
@@ -54,6 +56,7 @@ rmcp = { workspace = true, features = [
     "transport-io",
     "macros",
 ] }
+serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 tokio = { workspace = true, features = ["full"] }
 tracing = { workspace = true }