Support multi-line subsection descriptions in test docstrings via indentation

[Copilot]

Test docstrings using arrange:/act:/assert: or given:/when:/then: patterns required each line to be self-contained. Multi-line descriptions now use indentation to indicate continuation.

Changes

Parser logic (src/docstring.rs):

• Modified _get_sections() to recognize indented lines without : as continuations
• Changed from filter_map to explicit loop for continuation line handling

Python bindings (src/lib.rs, src/docstring.rs):

• Added #[getter] methods for _Section.name and _Section.subs
• Exported _get_sections to Python module

Tests:

• 4 Rust unit tests covering multiline patterns
• 4 Python integration tests
• Example file demonstrating usage

Example

Before:

def test_something():
    """
    arrange: Setup.
    act: Test.
    assert: Check.
    """

After:

def test_something():
    """
    arrange: Complex test setup requiring detailed explanation that
        spans multiple lines with proper indentation.
    act: Execute the test.
    assert: Verify expected behavior with detailed assertions.
    """

All existing docstrings remain valid. All 236 tests pass.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Every line in test docstrings has to end with .</issue_title>
<issue_description>In the test docstrings every line has to end with a .. This is not nice. Sometimes the docstring has to be tall and span a couple of lines.

We can use indentation to show that the sentence is continous.

Example:

def test_something():
    """
    arrange: This is a very important part of a very important test so
        the arrange sentence has to be loooong.
    act: Do the test.
    assert: It better not fail 😠.
    """
```</issue_description>

<agent_instructions>Remove the necessity to have comma at the end of each line in test docstrings and write tests to make sure it is working as intended
</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Every line in test docstrings has to end with . #1

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