refers to an ungenerated message in the map

[so1n]

Describe the bug
refers to an ungenerated message in the map

Dependencies

Input cmd:

python -m protobuf_to_pydantic --info
# OR
python -m protobuf_to_pydantic.plugin --info

Result:

# Paste the output of the command here

Protobuf File Content

Please check the Protobuf content for sensitive information

message DemoResp {
    map<int32, DemoState> demoState = 1;
    int64 pramsArea = 2;
    bool paramsSeason = 3;
}


message DemoState  {
    int64 paramsDID = 4;
}

Output content

class DemoResp(BaseModel):
    """
    The issue refers to an ungenerated message in the map
    """

    demoState: typing.Dict[int, DemoState] = Field(default_factory=dict)
    pramsArea: int = Field(default=0)
    paramsSeason: bool = Field(default=False)


class DemoState(BaseModel):
    paramsDID: int = Field(default=0)

Expected behavior
When referencing an ungenerated class, should use annotation:

class DemoResp(BaseModel):
    """
    The issue refers to an ungenerated message in the map
    """

    demoState: "typing.Dict[int, DemoState]" = Field(default_factory=dict)
    pramsArea: int = Field(default=0)
    paramsSeason: bool = Field(default=False)


class DemoState(BaseModel):
    paramsDID: int = Field(default=0)

Screenshots
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Additional context
Add any other context about the problem here.

[so1n]

from #87