support parameter "autosave" in DSN when connect to pg

[kuchaguangjie]

Describe the feature

1. I delete a column, without restart the server, and get following error:

   gorm cached plan must not change result type (SQLSTATE 0A000)

2. According to this post: https://stackoverflow.com/a/48536394, I tried to add param autosave=conservative into DSN for pg, then when start got error:

   failed to connect database: unrecognized configuration parameter "autosave" (SQLSTATE 42704)

So, can gorm try to support the autosave option in DSN for pg ?

Motivation

So than if db changed a bit, I don't have to restart the server.

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