Allow passing ParseOptions to inline tests (#16357)

## Summary

This PR adds support for a pragma-style header for inline parser tests
containing JSON-serialized `ParseOptions`. For example,

```python
# parse_options: { "target-version": "3.9" }
match 2:
    case 1:
        pass
```

The line must start with `# parse_options: ` and then the rest of the
(trimmed) line is deserialized into `ParseOptions` used for parsing the
the test.

## Test Plan

Existing inline tests, plus two new inline tests for
`match-before-py310`.

---------

Co-authored-by: Alex Waygood <alex.waygood@gmail.com>

crates/ruff_python_parser/Cargo.toml

@@ -29,10 +29,13 @@ unicode-normalization = { workspace = true }
 
 [dev-dependencies]
 ruff_annotate_snippets = { workspace = true }
+ruff_python_ast = { workspace = true, features = ["serde"] }
 ruff_source_file = { workspace = true }
 
 anyhow = { workspace = true }
 insta = { workspace = true, features = ["glob"] }
+serde = { workspace = true }
+serde_json = { workspace = true }
 walkdir = { workspace = true }
 
 [lints]