add convenient keymaps for test-command inspection

doc/test-samurai.txt

@@ -58,6 +58,8 @@ Additional keymaps:
   <leader>ss    Filter listing to [ SKIP ] only
   <leader>sa    Show all listing entries (clear filter)
   <leader>tt    Run the test under the cursor in the listing
+  <leader>cb    breaks test-command onto multiple lines
+  <leader>cj    joins test-command onto single line
   <leader>o     Jump to test location
   <leader>z     Toggle Detail-Float full width
   <C-l>         Focus Detail-Float (press l again for full)