Feat: add supports for stream mode

[RockChinQ]

Changes

• Add query method to wrap both stream and non-stream requests
• Make send_message a wrapper of non-stream mode request method
• Modified README

Related Issues

• Streaming? #58
• Can stream response be implemented?  #23
• When will streaming output be supported? #76
• 是否可以支持stream流式输出？ #68

Test Case

from claude_api import Client

cookie_str = "fill cookie here"

claude = Client(cookie_str)

conversation_id = claude.create_new_chat()['uuid']

stream = False

gen = claude.query(
    prompt="What is the meaning of life?",
    conversation_id=conversation_id,
    stream=stream,
)

import time

if stream:
    for msg in gen:
        print(time.time(), msg)
        
else:
    print(gen)

[RockChinQ]

Method query() returns a generator of str type when stream=True, it generates plain text of each tokens.
Returns plain text of response once when stream=False or by default.