feat: django compatibility field name

[waketzheng]

Description

There are some naming differences between Django and TortoiseORM:

#	Django	Tortoise
1	DateTimeField	DatetimeField
2	DurationField	TimeDeltaField
3	ForeignKey	ForeignKeyField
4	IntegerField	IntField
5	BigIntegerField	BigIntField
6	SmallIntegerField	SmallIntField

This PR creates aliases for them

Motivation and Context

Improve user experience

How Has This Been Tested?

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added the changelog accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

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_{Comparing waketzheng:develop (eb2007e) with develop (95b004c)}