feat: add post3 s3 proxy for postgresql

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/post3-sdk/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "post3-sdk"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+aws-sdk-s3 = "1"
+aws-credential-types = { version = "1", features = ["hardcoded-credentials"] }
+aws-types = "1"
+aws-config = "1"
+bytes.workspace = true
+thiserror.workspace = true
+chrono.workspace = true
+
+[dev-dependencies]
+tokio.workspace = true
+anyhow.workspace = true