[Core feature] Pydantic BaseModel V2 in Dataclass

[Future-Outlier]

Motivation: Why do you think this is important?

Some users want the below example works in a task/workflow.

from dataclasses import dataclass, field

# Define InnerBM using Pydantic BaseModel
class InnerBM(BaseModel):
    a: int = -1
    b: float = 3.14
    c: str = "Hello, Flyte"
    d: bool = False

# Define the dataclass DC
@dataclass
class DC:
    a: int = -1
    b: float = 3.14
    c: str = "Hello, Flyte"
    d: bool = False
    inner_bm: InnerBM = field(default_factory=lambda: InnerBM())

Goal: What should the final outcome look like, ideally?

These 2 cases should work.

https://github.com/flyteorg/flytekit/pull/2792/files#diff-779944519da7ce37ef29492b53edb53d653884263629341e4721c22d2223dedd

Describe alternatives you've considered

Keep it the same.

Propose: Link/Inline OR Additional context

flyteorg/flytekit#2792 (comment)

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes