Add a new python comment annotation that adds targets to `data`

# 🚀 feature request

### Relevant Rules

+ gazelle

### Description

This is the same as #1862, but for the `data` attribute on generated targets.

### Describe the solution you'd like

```python
# foo/bar/baz_test.py
import pathlib

# gazelle:include_data //foo/bar:test_data
TEST_DATA_DIR = pathlib.Path(__file__).parent / "test_data"

def test_main():
assert TEST_DATA_DIR.exists()
```

Running Gazelle generates:

```starlark
py_test(
name = "baz_test",
srcs = ["baz_test.py"],
data = ["//foo/bar:test_data"],
)
```

Note that Gazelle does _**not**_ generate the `test_data` target - it's still on the user to do that themselves.

### Describe alternatives you've considered

The current method is to manually add `data` attributes.

首先阅读相关 issue #1862 以及 Gazelle 中对现有 Python 注释标注的实现。跟踪标注如何影响生成的 target，然后为 `# gazelle:include_data` 添加相应处理，使 `data` 属性包含所请求的 label，同时不生成该 target。当示例产生所示的 `py_test` 输出且现有行为保持不变时，即表示完成。

由索引模型根据 Issue 内容生成。