Add resource to log

[mladjan-gadzic]

• expanded PartialActivityProcessor constructor to accept ResourceBuilder
• ResourceBuilder is set during LoggerFactory creation
• modified example
• added tests (exporter for tests pursposes has to be created because log record does not have resource and it has to be accessed on exporter level)

[mladjan-gadzic]

do we want to bump up version and release this?

[swythan]

How does this work in more typical usage with `ConfigureResource()?

        services.AddOpenTelemetry()
            .UseOtlpExporter()
            .ConfigureResource(r => r.AddService("MyApplicationName", serviceVersion: "1.3.2"));