S3 method for `getAdatVersion()`

[stufield]

Overview of Pull Request

• Added S3 method for getAdatVersion()

• documentation upgrades

• new unit tests

• S3 method dispatch: default, list, soma_adat classes

Closes #92

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[codecov-commenter]

Codecov Report

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

Project coverage is 75.30%. Comparing base (7d95b3f) to head (1ff2c59).

:exclamation: Current head 1ff2c59 differs from pull request most recent head d54a6c4. Consider uploading reports for the commit d54a6c4 to get more accurate results

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #94 +/- ## ========================================== + Coverage 75.23% 75.30% +0.06% ========================================== Files 41 41 Lines 1474 1478 +4 ========================================== + Hits 1109 1113 +4 Misses 365 365 ```

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