Tricky to debug parameter query limits

[rkistner]

When running into parameter query limits, and error message such as this is displayed:

[PSYNC_S2305] Too many parameter query results: 1234 (limit of 1000)

What makes this tricky to debug is that the parameter query results could be way more than the number of buckets in case of duplicates - number of buckets exclude duplicates, while parameter query results include duplicates. So one user may go from successfully syncing 20 buckets in one moment, then hitting the parameter query results limit the next.

To assist with debugging, additional logs on the service may help:

1. Include the number of parameter query results in the logs, not only the number of buckets.
2. When the limit is reached, log the number of parameter query results for each bucket or sync stream definition separately (or potentially only say the top 10 or so to limit the log length).

[hamzzy]

@rkistner i have created a PR for this here
#462 review at your at most convenience