Add Support for PostgreSQL Infinity and -Infinity in Date/Time Fields

[Kavin Bharathi]

Proposed Feature:

1. Add support for parsing PostgreSQL's infinity and -infinity values into Django models.
2. Represent infinity and -infinity using custom Python objects or constants (e.g., django.db.utils.Infinity and -Infinity).
3. Ensure seamless integration with Django's ORM for querying, inserting, and updating fields containing these values.
4. Provide a mechanism to serialize and deserialize these values (e.g., JSON serialization).

Use Cases:

1. Handling open-ended event durations.
2. Representing date ranges without a start or end boundary.
3. Supporting applications that already use these values in their PostgreSQL databases.

Benefits:

1. Enables Django developers to work with PostgreSQL databases more effectively.
2. Expands Django's compatibility with PostgreSQL's advanced features.

Potential Challenges:

1. Ensuring backward compatibility with existing applications.
2. Deciding on a Python representation for infinity that integrates well with Django's ORM and other Python libraries.

References:

[PostgreSQL Documentation on Infinity](​https://www.postgresql.org/docs/current/datatype-datetime.html#DATATYPE-DATETIME-SPECIAL-VALUES)