Add logging and monitoring in case we have minimum memory recommendations

[plkokanov]

What this PR does / why we need it:
This PR re-adds additional logging in case the vpa-recommender provides memory recommendations lower than the minimum from #299. In addition it limits the logging only when the recommendation is done for memory and adds a counter metric when such an event occurs so we can track how many times such recommendations are done for each vpa object.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

Add a counter metric which can be used to track how many times lower than minimum memory recommendations have been done by the `vpa-recommender`. The full name of the metric is `vpa_quality_lower_than_min_recommendation_count`.

[ialidzhikov]

/lgtm