Add cli subcommands

* adding `pgcat config show` to show general configuration
* adding `pgcat config pools list` to list all pools configuration

Signed-off-by: Dickson S. Guedes <[email protected]>

Author: guedes

Cargo.lock

@@ -46,6 +46,7 @@ tokio-test = "0.4.2"
 serde_json = "1"
 itertools = "0.10"
 clap = { version = "4.3.1", features = ["derive", "env"] }
+prettytable-rs = "^0.10"
 tracing = "0.1.37"
 tracing-subscriber = { version = "0.3.17", features = ["json", "env-filter", "std"]}