add support for composed estimands in from_param_file

[codecov[bot]]

Codecov Report

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

Project coverage is 96.67%. Comparing base (7795fe7) to head (dafd67c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #190 +/- ## ========================================== + Coverage 96.60% 96.67% +0.07% ========================================== Files 11 11 Lines 796 813 +17 ========================================== + Hits 769 786 +17 Misses 27 27 ```

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