Added variants support in Python CDA SDK

[sunil-lakshman]

1. Variants support Added.
2. Added variants testcases

[Copilot]

Pull Request Overview

This PR introduces support for fetching and testing entry variants in the Python CDA SDK.

• Adds a new Variants class with find and fetch methods
• Exposes .variants() on Entry and ContentType
• Adds corresponding unit tests and updates SDK version and changelog

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/test_entry.py	Adds VARIANT_UID and 4 new variant-related test cases
contentstack/variants.py	Implements Variants class for variant endpoints
contentstack/entry.py	Adds .variants() method to Entry
contentstack/contenttype.py	Adds .variants() method to ContentType
contentstack/init.py	Bumps SDK version to v2.2.0
CHANGELOG.md	Documents variants support under v2.2.0

Comments suppressed due to low confidence (3)

tests/test_entry.py:153

• Duplicate test identifier 'test_25_' found. Rename this test to a unique sequential number (e.g., test_26_) to avoid collisions in the test suite.

    def test_25_content_type_entry_variants_with_has_hash_variant(self):

contentstack/variants.py:72

• [nitpick] Duplicate docstring block detected. Consolidate the variant-fetching description into a single docstring to avoid redundancy.

        """

contentstack/variants.py:36

• The params argument in find isn't covered by existing tests; consider adding a test to verify that query parameters are correctly encoded and sent.

    def find(self, params=None):