Adds `within` and `eval_code` to `teal_data_module` #1455

All 199 tests pass in 12s

    1 files ±0   19 suites ±0 12s ⏱️ ±0s
199 tests - 1 199 ✔️ - 1 0 💤 ±0 0 ❌ ±0
373 runs - 3 373 ✔️ - 3 0 💤 ±0 0 ❌ ±0

Results for commit 51dcadf. ± Comparison against earlier commit 8bf8aaa.