add llama-2-7b e2e example

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 29.58%. Comparing base (3654c25) to head (49d733e). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1026 +/- ## ======================================= Coverage 29.58% 29.58% ======================================= Files 47 47 Lines 2819 2819 ======================================= Hits 834 834 Misses 1952 1952 Partials 33 33 ```

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