fix(mongo,postgres): create/upsert autoInc field with primary set

[Hieuzest]

Consider the following snippets with autoInc enabled:

await database.create('foo', { id: 1 })
await database.create('foo', { num: 1 })

Currently in mongo driver, create({ id: 1}) will not update autoInc field, thus the second create({ num: 1 }) will get the same id=1, causing duplicate primary error.

PostgreSQL's serial type acts exactly our mongo's way. It only update itself when triggering default. The PR gives a workaround but i have no idea whether there exists better solution.

Unit tests are missing in the PR because there are not proper file to write them. (current update.ts will not run into problem cuz the autoInc is already high enough in that case) We should write them in model.ts later the other PR is merged.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.34%. Comparing base (1b88ce9) to head (78e002f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #77   +/-   ##
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  Coverage   98.34%   98.34%           
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  Files          36       36           
  Lines        7964     7988   +24     
  Branches     1997     2037   +40     
=======================================
+ Hits         7832     7856   +24     
  Misses        132      132           

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