[Feature]: Create arbitrary log spans

### 💡 Feature Description and Proposed Solution

Langfuse has the functionality that lets users create log-style spans. They look something like this:
```
self.trace.event(name="xml_tool_call_limit_reached", level="DEFAULT", status_message=(
f"XML tool call limit reached - not yielding more content chunks"))
```

This is convenient for just showing where things might've gone wrong in a trace.

It would be great to have 2 functions:

* `agentops.log(...)`
* `agentops.error(...)`

### 🤔 Related Problem

_No response_

### 🤝 Contribution

- [ ] Yes, I'd be happy to submit a pull request with these changes.
- [ ] I need some guidance on how to contribute.
- [ ] I'd prefer the AgentOps team to handle this update.