Adds `within` and `eval_code` to `teal_data_module` #1437

All 200 tests pass in 12s

    1 files ±0   19 suites ±0 12s ⏱️ ±0s
200 tests ±0 200 ✔️ ±0 0 💤 ±0 0 ❌ ±0
376 runs ±0 376 ✔️ ±0 0 💤 ±0 0 ❌ ±0

Results for commit fa6ef28. ± Comparison against earlier commit 9605f05.