Support for prepared statements (#474)

* Start prepared statements

* parse

* Ok

* optional

* dont rewrite anonymous prepared stmts

* Dont rewrite anonymous prep statements

* hm?

* prep statements

* I see!

* comment

* Print config value

* Rewrite bind and add sqlx test

* fmt

* ok

* Fix

* Fix stats

* its late

* clean up PREPARE

tests/rust/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+sqlx = { version = "0.6.2", features = [ "runtime-tokio-rustls", "postgres", "json", "tls", "migrate", "time", "uuid", "ipnetwork"] }
+tokio = { version = "1", features = ["full"] }