refactor: Introduce crates folder (#2088)

This PR introduces a new `crates` directory and moves all "product" crates into that folder. 

Part of #2059.

crates/ruff_dev/src/generate_all.rs

@@ -0,0 +1,28 @@
+//! Run all code and documentation generation steps.
+
+use anyhow::Result;
+
+use crate::{generate_cli_help, generate_json_schema, generate_options, generate_rules_table};
+
+#[derive(clap::Args)]
+pub struct Args {
+    /// Write the generated artifacts to stdout (rather than to the filesystem).
+    #[arg(long)]
+    dry_run: bool,
+}
+
+pub fn main(args: &Args) -> Result<()> {
+    generate_json_schema::main(&generate_json_schema::Args {
+        dry_run: args.dry_run,
+    })?;
+    generate_rules_table::main(&generate_rules_table::Args {
+        dry_run: args.dry_run,
+    })?;
+    generate_options::main(&generate_options::Args {
+        dry_run: args.dry_run,
+    })?;
+    generate_cli_help::main(&generate_cli_help::Args {
+        dry_run: args.dry_run,
+    })?;
+    Ok(())
+}