pg_stat_monitor.pgsm_normalized_query needs to be 0 by default because
people will get Query examples. This is one of the main user-faced
advantages of pgsm over pgss (pg_stat_statements).
This commit adds following three sql based testcases:
1) Test unique application name set by user.
2) Histogram function is working properly as desired.
3) Error on insert is shown with proper message.
Ibrar Ahmed
Naeem Akhter
Ibrar Ahmed