Expose the names of a module's defined function via modulemeta

This reuses the existing `block_list_funcs` capability and adds an extra field on the `modulemeta` output, called `defs`, containing that list of functions.

src/linker.c

@@ -390,6 +390,7 @@ jv load_module_meta(jq_state *jq, jv mod_relpath) {
       if (jv_get_kind(meta) == JV_KIND_NULL)
         meta = jv_object();
       meta = jv_object_set(meta, jv_string("deps"), block_take_imports(&program));
+      meta = jv_object_set(meta, jv_string("defs"), block_list_funcs(program, 0));
     }
     locfile_free(src);
     block_free(program);

tests/jq.test

@@ -1624,11 +1624,15 @@ jq: error: Import path must be constant at <top-level>, line 1:
 
 modulemeta
 "c"
-{"whatever":null,"deps":[{"as":"foo","is_data":false,"relpath":"a"},{"search":"./","as":"d","is_data":false,"relpath":"d"},{"search":"./","as":"d2","is_data":false,"relpath":"d"},{"search":"./../lib/jq","as":"e","is_data":false,"relpath":"e"},{"search":"./../lib/jq","as":"f","is_data":false,"relpath":"f"},{"as":"d","is_data":true,"relpath":"data"}]}
+{"whatever":null,"deps":[{"as":"foo","is_data":false,"relpath":"a"},{"search":"./","as":"d","is_data":false,"relpath":"d"},{"search":"./","as":"d2","is_data":false,"relpath":"d"},{"search":"./../lib/jq","as":"e","is_data":false,"relpath":"e"},{"search":"./../lib/jq","as":"f","is_data":false,"relpath":"f"},{"as":"d","is_data":true,"relpath":"data"}],"defs":["a/0","c/0"]}
 
-modulemeta | .deps |= length
+modulemeta | .deps | length
 "c"
-{"whatever":null,"deps":6}
+6
+
+modulemeta | .defs | length
+"c"
+2
 
 %%FAIL IGNORE MSG
 import "syntaxerror" as e; .