Change Summary

Following work on the pydantic-core branch, this PR implements the config hooks to allowser_json_temporal to be passed in.

Related issue number

Fixes#10454
Fixes#7940

Performance improvements

The main reason we wanted this was to improve performance when we want to serialize a datetime as a millisecond timestamp. Below is a small script using this branch:

fromtypingimportAnnotatedimportpendulumimportdatetimeasdtfrompydanticimportBaseModel,PlainSerializerimporttqdmimporttimeRANGE=10dts= [dtfordtinpendulum.interval(pendulum.datetime(2023,1,1),pendulum.datetime(2024,1,1)).range("seconds",30)]T_SerializedDatetime=Annotated[dt.datetime,PlainSerializer(lambdax:x.timestamp()*1000,return_type=float,when_used="json",    ),]classMyModelOld(BaseModel):"""A model with a datetime field."""dts:list[T_SerializedDatetime]classMyModelNew(BaseModel):"""A model with a datetime field."""dts:list[dt.datetime]model_config= {"ser_json_temporal":"milliseconds"    }instance_old=MyModelOld(dts=dts)instance_new=MyModelNew(dts=dts)t=time.time()for_intqdm.tqdm(range(RANGE)):instance_old.model_dump_json()print(time.time()-t)t=time.time()for_intqdm.tqdm(range(RANGE)):instance_new.model_dump_json()print(time.time()-t)

I've run this over a few different number of dts to try gauge performance. A note is that im not 100% sure how this is being built for me when im installing, i doubt its using PGO and not sure if its the dev or prod profile, so i'd guess performance will improve from these results.

For the second conversion:

and for the millisecond conversion:

So for us, this is a great improvement, esspecially for when we need to return large timeseries.

NOTE: currently based against a branch of pydantic-core, because theres no pydantic core release yet.

Checklist

• The pull request title is a good summary of the changes - it will be used in the changelog
• [] Unit tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable
• My PR is ready to review,please add a comment including the phrase "please review" to assign reviewers