Adding support for vrange command.

[petyaslavova]

Description of change

Please provide a description of the change here.

Pull Request check-list

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• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
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[Copilot]

Pull request overview

This pull request adds support for the VRANGE command, which returns elements in a lexicographical range from a vector set. The implementation includes a new method in the VectorSetCommands class and comprehensive test coverage for both synchronous and asynchronous usage.

Changes:

• Added vrange method to support lexicographical range queries on vector sets
• Added comprehensive test suite covering basic functionality, count parameter, iteration patterns, edge cases, and special characters
• Tests verify both synchronous and async implementations

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
redis/commands/vectorset/commands.py	Adds VRANGE_CMD constant and vrange() method implementation with support for lexicographical range queries and optional count parameter
tests/test_vsets.py	Adds 8 comprehensive test functions covering various VRANGE scenarios including basic ranges, count parameter, iteration, empty keys, special characters, single elements, lexicographical ordering, and numeric strings
tests/test_asyncio/test_vsets.py	Adds identical async versions of the 8 VRANGE test functions with proper await syntax

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