Add support for both pydantic v1 and v2

[sevaho]

Add support for pydantic v2

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces a compatibility layer to support both Pydantic v1 and v2. It includes changes to model definitions, field creation, and schema generation to accommodate the differences between the two Pydantic versions. The changes ensure that the application can function correctly with either Pydantic version.

Updated class diagram for ModelField

classDiagram
    class ModelField {
        +name: str
        +type_: Any
        +required: bool
        +default: Any
        +alias: str
        +field_info: FieldInfo
    }
    note for ModelField "This class has been updated to be compatible with both Pydantic v1 and v2. The attributes and methods have been modified to reflect the changes in Pydantic's API."

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Class diagram for GenerateJsonSchema

classDiagram
    class GenerateJsonSchema {
        +ref_template: str
    }
    note for GenerateJsonSchema "This class is used to generate JSON schemas for Pydantic models. It has been updated to be compatible with both Pydantic v1 and v2."

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File-Level Changes

Change	Details	Files
Add compatibility layer for Pydantic v1 and v2.	Introduced a _compat.py file to handle differences between Pydantic versions. Added conditional imports and type definitions based on the Pydantic version. Created compatibility functions for model name mapping. Added RootModel to _compat.py for pydantic v1 support.	natsapi/_compat.py natsapi/utils.py natsapi/asyncapi/utils.py natsapi/encoders.py natsapi/client/config.py tests/test_jsonable_encoder.py
Update default values for optional fields in AsyncAPI models.	Set default values to None for optional fields in asyncapi/models.py. This ensures that these fields are not required during validation if not provided.	natsapi/asyncapi/models.py
Refactor get_asyncapi to use compat model name map and schema generation.	Replaced get_model_name_map with get_compat_model_name_map in get_asyncapi. Utilized GenerateJsonSchema for schema generation. Modified how definitions are obtained using get_definitions. Updated references to pub parameters to use __name__ instead of relying on model_name_map.	natsapi/asyncapi/utils.py
Adjust field creation in create_field to handle Pydantic v2.	Modified create_field to conditionally set field_info based on the Pydantic version. Added kwargs to handle differences between pydantic versions.	natsapi/utils.py
Update jsonable_encoder to use model_config for json_encoders in pydantic v2.	Modified jsonable_encoder to access json_encoders from model_config when using Pydantic v2.	natsapi/encoders.py

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