feat: add tool error logging

[danilbogdan]

Currently there is no way to log errors other than providing failure_error_function in each function_tool decorator use. Current PR provides env variable OPENAI_AGENTS_LOG_TOOL_ERRORS that enables such logs.

[rm-openai]

Can we just log them directly? You can use the existing log data flag to either just log "tool failed" or f"tool failed {input} {error}"

[danilbogdan]

Done. However, I’m now uncertain about the purpose of this flag.

The reason of PR is that I couldn’t detect tool failures in production, not just in debug mode. I assumed that not everyone wanted to log tool errors, which is why I included the flag that, by default, maintains the current behavior but allows enabling error logs.

Now, by default, we log everything, and in debug mode, we can hide some data which is useless imho.