Allow excluding Logback MDC attributes from being copied

[cfredri4]

Is your feature request related to a problem? Please describe.

I use OpenTelemetryAppender and configure it to capture all MDC attributes since I have different MDC attributes on my many services.

But I have trace id and span id on the MDC which means they now get exported twice.

Describe the solution you'd like

E.g. OpenTelemetryAppender.setExcludeMdcAttributes("traceId,spanId")

Describe alternatives you've considered

No response

Additional context

No response

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