feat: set dummy data

[uniqueg]

Fixes #56

Type of change

• [x] New feature (non-breaking change which adds functionality)

Checklist

• [x] I have performed a self-review of my own code
• [x] My code follows the existing coding style, lints and generates no new warnings
• [x] I have added type annotations to all function/method signatures, and I have added type annotations for any local variables that are non-trivial, potentially ambiguous or might otherwise benefit from explicit typing.
• [x] I have commented my code in hard-to-understand areas
• [x] I have added Google-style docstrings to all new modules, classes, methods/functions or updated previously existing ones
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes and I have not reduced the code coverage relative to the previous state
• [x] I have updated any sections of the app's documentation that are affected by the proposed changes

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (0c702f8) 100.00% compared to head (6aa7697) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #57 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 21 22 +1 Lines 1041 1071 +30 ========================================= + Hits 1041 1071 +30 ``` | [Impacted Files](https://app.codecov.io/gh/zavolanlab/zarp-cli/pull/57?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zavolanlab) | Coverage Δ | | |---|---|---| | [zarp/plugins/sample\_processors/defaults.py](https://app.codecov.io/gh/zavolanlab/zarp-cli/pull/57?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zavolanlab#diff-emFycC9wbHVnaW5zL3NhbXBsZV9wcm9jZXNzb3JzL2RlZmF1bHRzLnB5) | `100.00% <100.00%> (ø)` | | | [zarp/plugins/sample\_processors/dummy\_data.py](https://app.codecov.io/gh/zavolanlab/zarp-cli/pull/57?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zavolanlab#diff-emFycC9wbHVnaW5zL3NhbXBsZV9wcm9jZXNzb3JzL2R1bW15X2RhdGEucHk=) | `100.00% <100.00%> (ø)` | | | [zarp/zarp.py](https://app.codecov.io/gh/zavolanlab/zarp-cli/pull/57?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zavolanlab#diff-emFycC96YXJwLnB5) | `100.00% <100.00%> (ø)` | |

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