add template_slice_config to run_train_config

[zjgemi]

https://github.com/deepmodeling/dpgen2/issues/191

[codecov[bot]]

Codecov Report

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

Comparison is base (c0f1973) 87.56% compared to head (37fb1e9) 87.57%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #193 +/- ## ======================================= Coverage 87.56% 87.57% ======================================= Files 83 83 Lines 4183 4184 +1 ======================================= + Hits 3663 3664 +1 Misses 520 520 ```

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