Pull action_log into its own crate (#35959)

Release Notes:

- N/A

crates/assistant_tools/src/create_directory_tool.rs

@@ -1,6 +1,7 @@
 use crate::schema::json_schema_for;
+use action_log::ActionLog;
 use anyhow::{Context as _, Result, anyhow};
-use assistant_tool::{ActionLog, Tool, ToolResult};
+use assistant_tool::{Tool, ToolResult};
 use gpui::AnyWindowHandle;
 use gpui::{App, Entity, Task};
 use language_model::{LanguageModel, LanguageModelRequest, LanguageModelToolSchemaFormat};