[PR] fix(db_engine_specs): add a few missing time grains to Postgres spec [superset]

[via GitHub]

sfirke opened a new pull request, #30325:
URL: https://github.com/apache/superset/pull/30325

   ### SUMMARY
   I added to the Postgres engine spec definitions for some of the time grains 
that are defined in the base spec but had not been added to Postgres yet.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   
![image](https://github.com/user-attachments/assets/1c597954-7ba4-4556-af93-26ce4ac6e7e3)
   
   ### TESTING INSTRUCTIONS
   In an ephemeral environment, confirm that the grains are there and that the 
generated queries are correct.


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