Add pyarrow date and timestamp type conversion from pydantic

[prrao87]

Closes #575 -- Missing pydantic types in python are properly converted to their pyarrow equivalents.

• Convert python date type to pyarrow pa.date32() type
• Convert python datetime type to pyarrow pa.timestamp('us') type
• Tests passing on my end 👍🏼

It works great for both regular dates and datetimes.

class Content(LanceModel):
    text: str
    created: date
    timestamp: datetime

db = lancedb.connect("test")
tbl = db.create_table("test", schema=pydantic_to_schema(Content), mode="overwrite")

# Add some data
data = Content(text="Hello", created=date.today(), timestamp=datetime.now())
tbl.add([data])

# Query data
print(tbl.search().to_pandas())

Gives:

    text     created                  timestamp
0  Hello  2023-10-16 2023-10-16 22:37:10.499493

[changhiskhan]

This looks great thanks!