Fix pack_command type annotation to accept variable-length tuples

[Copilot]

The pack_command type annotation incorrectly specified Tuple[str | int | float | bytes | memoryview], which accepts only single-element tuples. The function actually accepts variable-length tuples as evidenced by its test suite.

Changes:

• Updated type signature from Tuple[T] to Tuple[T, ...] to accept variable-length tuples
• Added missing -> bytes return type annotation

Example:

# These calls now type-check correctly:
libvalkey.pack_command(("SET", "key", "value"))
libvalkey.pack_command(("HSET", "foo", "key1", "val1", "key2", "val2"))

Related to redis/hiredis-py#195

Original prompt

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This section details on the original issue you should resolve

<issue_title>Fix pack_command type annotation</issue_title>
<issue_description>Similar to redis/hiredis-py#195, pack_command should be annotated to accept a tuple of more than one element. Currently it's Tuple[A], which means a tuple of exactly one element. Tuple[A, ...] is probably intended.</issue_description>

<agent_instructions>Verify if the suggested change is indeed correct</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Fix pack_command type annotation #39

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[Copilot]

Pull Request Overview

This PR corrects the type annotation for the pack_command function to properly reflect that it accepts variable-length tuples rather than single-element tuples.

• Fixed pack_command type signature from Tuple[T] to Tuple[T, ...] to accept variable-length tuples
• Added missing -> bytes return type annotation

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