zeta cli: Add convert-example command (#41608)

Adds a `convert-example` subcommand to the zeta cli that converts eval
examples from/to `json`, `toml`, and `md` formats.

Release Notes:

- N/A

---------

Co-authored-by: Max Brunsfeld <[email protected]>

Author: agu-z

Cargo.lock

@@ -212,7 +212,7 @@ pub fn write_codeblock<'a>(
     include_line_numbers: bool,
     output: &'a mut String,
 ) {
-    writeln!(output, "`````path={}", path.display()).unwrap();
+    writeln!(output, "`````{}", path.display()).unwrap();
     write_excerpts(
         excerpts,
         sorted_insertions,

crates/cloud_zeta2_prompt/src/cloud_zeta2_prompt.rs

@@ -64,7 +64,7 @@ const SEARCH_PROMPT: &str = indoc! {r#"
 
     ## Current cursor context
 
-    `````path={current_file_path}
+    `````{current_file_path}
     {cursor_excerpt}
     `````
 

crates/zeta2/src/related_excerpts.rs

@@ -39,8 +39,10 @@ paths.workspace = true
 polars = { version = "0.51", features = ["lazy", "dtype-struct", "parquet"] }
 project.workspace = true
 prompt_store.workspace = true
+pulldown-cmark.workspace = true
 release_channel.workspace = true
 reqwest_client.workspace = true
+toml.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 settings.workspace = true