Remove unused crates in the tests/ and examples/ code

Unfortunately `cargo +nightly udeps --tests --no-default-features --features
integration_test,datafusion,s3-native-tls` did not produce more unused
dependencies which means there is fewer cruft to chop out of these dependency
trees at the moment.

Related to delta-io#1550

Sponsored-by: Databricks In

rust/Cargo.toml

@@ -91,8 +91,6 @@ tempdir = { version = "0", optional = true }
 dynamodb_lock = { version = "0", default-features = false, optional = true }
 
 [dev-dependencies]
-anyhow = "1"
-criterion = "0"
 dotenvy = "0"
 maplit = "1"
 pretty_assertions = "1.2.1"

rust/examples/recordbatch-writer.rs

@@ -28,10 +28,11 @@ use std::sync::Arc;
  * example code for writing to Delta tables
  */
 #[tokio::main]
-async fn main() -> Result<(), anyhow::Error> {
+async fn main() -> Result<(), DeltaTableError> {
     info!("Logger initialized");
 
-    let table_uri = std::env::var("TABLE_URI")?;
+    let table_uri = std::env::var("TABLE_URI")
+        .map_err(|e| DeltaTableError::GenericError { source: Box::new(source) })?;
     info!("Using the location of: {:?}", table_uri);
 
     let table_path = Path::from(table_uri.as_ref());