Initial Checks

• I have searched Google & GitHub for similar requests and couldn't find anything
• I have read and followed the docs and still think this feature is missing

Description

Working with Paths is fairly common and I usually end up writing my own field validator over and over again because the type I want is missing. I would like to see the Path types in pydantic extended with some more potentially useful types:

1. ExistingPath - Union[FilePath, DirectoryPath]
2. ResolvedFilePath - A file that get's resolved (pathlib.Path.expanduser().resolve()) by pydantic before returning
3. ResolvedDirectoryPath - A directory that get's resolved (pathlib.Path.expanduser().resolve()) by pydantic before returning
4. ResolvedPath - Union[ResolvedFilePath, ResolvedDirectoryPath]

My current solution is to just write a field validator:

    @field_validator("path_a", "path_b")
    @classmethod
    def resolve_path(cls, path: Path) -> Path:
            """Resolve all given Path fields"""
            return path.expanduser().resolve()

Affected Components

• Compatibility between releases
• Data validation/parsing
• Data serialization - .model_dump() and .model_dump_json()
• JSON Schema
• Dataclasses
• Model Config
• Field Types - adding or changing a particular data type
• Function validation decorator
• Generic Models
• Other Model behaviour - model_construct(), pickling, private attributes, ORM mode
• Plugins and integration with other tools - mypy, FastAPI, python-devtools, Hypothesis, VS Code, PyCharm, etc.