feat(messages): add client-side validation for temperature, top_p, and top_k

[Ashutosh0x]

feat(messages): add client-side validation for temperature, top_p, and top_k

This PR adds client-side validation for sampling parameters to ensure they are within the ranges expected by the API, resolving #893.

Changes

• Added a validate_sampling_params helper function to enforce:
  • temperature: 0.0 to 1.0
  • top_p: 0.0 to 1.0
  • top_k: >= 0
• Integrated validation into Messages.create() and Messages.stream() (sync and async).
• Integrated validation into Beta Messages.create(), Messages.parse(), Messages.stream(), and Messages.tool_runner() (sync and async).

Verification

Verified with a reproduction script testing both standard and beta resources with various invalid values. All tests passed, raising ValueError as expected instead of sending invalid requests to the API.

# Example of failure
client.messages.create(
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
    model="claude-3-opus-20240229",
    temperature=-1.0
)
# Raises: ValueError: Invalid temperature: -1.0; must be between 0.0 and 1.0