[PR] [opt](Nereids) use date signature for date arithmetic as far as possible [doris]

[via GitHub]

morrySnow opened a new pull request, #35863:
URL: https://github.com/apache/doris/pull/35863

   if date arithmetic (date_add / date_sub)'s first argument is 
StringLikeLiteral. We use date signature as far as possible.
   
   for example:
   
   SQL: `select date_sub('2024-05-28', INTERVAL 1 week);`
   
   before this PR:
   ```
   +------------------------------------------------+
   | weeks_sub(cast('2024-05-28' as DATETIMEV2), 1) |
   +------------------------------------------------+
   | 2024-05-21 00:00:00                            |
   +------------------------------------------------+
   ```
   
   after this PR:
   ```
   +--------------------------------------------+
   | weeks_sub(cast('2024-05-28' as DATEV2), 1) |
   +--------------------------------------------+
   | 2024-05-21                                 |
   +--------------------------------------------+
   ```
   


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