[BUGFIX beta] Add more debugging info to each, with, and unless helpers

Possible cases:

- `{{each}}`
- `{{each items}}`
- `{{each item in items}}`
- `{{unless isEdit}}`
- `{{with subject}}`
- `{{with subject as person}}`
Merge pull request #4939 from teddyzeenny/helper-debug-info

[BUGFIX beta] Add more debugging info to each, with, and unless helpers