scraperhelper: use common scraping interface #3487
Merged
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This removes the MetricsScraper and ResourceMetricsScraper interfaces in favor
of a single Scraper interface that scrapes and returns pdata.Metrics. There
were already helper wrappers that allow users to return MetricSlices and
ResourceMetricSlices. These helpers package those results into pdata.Metrics
for the base interface.
Resolves #3085: This also removes the multiMetricScraper which wrapped multiple
scrapers to appear as a single scraper but then functions like scraper.ID()
would be empty. This was evident when trying to log errors and you couldn't
figure out what scraper made the error because it was wrapped in the
multiscraper.