fix datetime64 parsing

[rubemz]

This is a PR to fix DateTime64 when defined in the schema as:

 field(:timestamp, Ch, type: "DateTime64(3)")

This is what is happening afaik:

• dumper returns :naive_datetime_usec here
• ecto transforms the given DateTime as NaiveDateTime here

The code I changed in ecto_ch returns DateTime as param_type instead of DateTime64(<precision>)

My test suite is erroring (without this fix) with:

  ** (Ch.Error) Code: 457. DB::Exception: Value 2024-08-14T20:55:30.094116 cannot be parsed as DateTime for query parameter '$1' because it isn't parsed completely: only 19 of 26 bytes was parsed: 2024-08-14T20:55:30. (BAD_QUERY_PARAMETER) (version 23.12.1.1368 (official build))

I added a test that raises a similar error and fixed it with a very similar code change that was recently introduced to support DateTime64

[ruslandoga]

👋 @rubemz

Thank you!

I changed the tests a bit and re-applied your fix in #191

[rubemz]

@ruslandoga thanks a lot!