[FEATURE] make event loop settings configurable

[liuyangc3]

Problem Statement

now the settings are hardcode in event_loop.py

MAX_ATTEMPTS = 6
INITIAL_DELAY = 4
MAX_DELAY = 240  # 4 minutes

Proposed Solution

For example pass a parameter like event_loop_config into Agent

agent =Agent(
    model="...",
    system_prompt="..."
    event_loop_config={
        "max_attempts": 6,
        "initial_delay": 4,
        "max_delay": 240
    }
)

Use Case

To control event_loop behaviour, for example sometimes we'd like code fail fast for testing purpose, we dont want too much retries.

Alternatives Solutions

No response

Additional Context

No response