Keep the default span processor when `processors` is passed to `logfire.configure()`

[alexmojaki]

Closes https://github.com/pydantic/logfire/issues/99

This is a breaking change, but since we'll probably do this eventually anyway it's best to do it now. I can't see a reason for the current behaviour.

[adriangb]

I assume if you want to get rid of the default processor you're supposed to pass send_to_logfire=False?

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[alexmojaki]

Yes

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[alexmojaki]

OK I've renamed, and processors will now raise an error telling you to use additional_span_processors.

[adriangb]

Looks great!