Add s3 as data source (#12151)

* use s3fs

* when key=none

* use s3fs

* changelog + version bump

* tests + serialization

* changelog

* pants update

* module mappings

* add files reader to BUILD

* more BUILD

* add s3 to enum

* fix schema

* give BaseReader a __modify_schema__

* give BaseReader a __modify_schema__

* dont use ModelField

* remove validators

* Support schema in BaseReader for PydanticV2

---------

Co-authored-by: Logan Markewich <logan.markewich@live.com>