Fix saving string pks

Fix issue #46 , also added refresh after save() if any field has server_default set and field not set (so it will be populated by server default

Add upsert, save_related, allow dict in fields and exclude_fields, optimisation and cleanup etc.

• Added save status -> you can check if model is saved with ModelInstance.saved property
  • Model is saved after save/update/load/upsert method on model
  • Model is saved after create/get/first/all/get_or_create/update_or_create method
  • Model is saved when passed to bulk_update and bulk_create
  • Model is saved after adding/removing ManyToMany related objects (through model instance auto saved/deleted)
  • Model is not saved after change of any own field (including pk as Model.pk alias)
  • Model is not saved after adding/removing ForeignKey related object (fk column not saved)
  • Model is not saved after instantation with __init__ (w/o QuerySet.create or before calling save)
• Added Model.upsert(**kwargs) that performs save() if pk not set otherwise update(**kwargs)
• Added Model.save_related(follow=False) that iterates all related objects in all relations and checks if they are saved. If not it calls upsert() on each of them.
• Breaking: added raising exceptions if add-ing/remove-ing not saved (pk is None) models to ManyToMany relation
• Allow passing dictionaries and sets to fields and exclude_fields
• Auto translate str and lists to dicts for fields and exclude_fields
• Breaking: passing nested models to fields and exclude_fields is now by related ForeignKey name and not by target model name
• Performance optimizations - in modelproxy, newbasemodel - > less queries, some properties are cached on models
• Cleanup of unused relations code
• Optional performance dependency orjson added (strongly recommended)
• Updated docs

Add exclude_fields, fix order_by

• add exclude_fields() method to exclude fields from sql
• refactor column names setting (aliases)
• fix ordering by for column with aliases
• additional tests for fields and exclude_fields
• update docs

Include property methods as fields in dict() and json()

Merge pull request #34 from collerek/include_properties_in_dict_and_json

Include properties in dict and json

Allow returning related models with only pk set through fastapi

Merge pull request #32 from collerek/allow_pk_models_fastapi

allow in fastapi to return related models with only pk populated

Add order_by to QuerySet

Add order_by to QuerySet
Update docs

Provide support for proper type hints - change of model definition (non breaking)

• Changed notation in Model definition -> now use name = ormar.Field() not name: ormar.Field()
• Note that old notation is still supported but deprecated and will not play nice with static checkers like mypy and pydantic pycharm plugin
• Type hint docs and test
• Use mypy for tests also not, only ormar package
• Fix scale and precision translation with max_digits and decimal_places pydantic Decimal field
• Update docs - add best practices for dependencies
• Refactor metaclass and model_fields to play nice with type hints
• Add mypy and pydantic plugin to docs
• Expand the docs on ManyToMany relation

Fix server_default field parameter and update docs

See details in #26

Fix postgresql check to avoid exceptions with drivers not installed

Fix issue #23

Fix json schema generation

• Fix json schema generation as of #19
• Fix for not initialized ManyToMany relations in fastapi copies of ormar.Models
• Update docs in regard of fastapi use
• Add tests to verify fastapi/docs proper generation
• Modify schema so that ManyToMany fields show list of nested models in fastapi schema