feat(data-classes): Add appsync scalar_types_utils and add support for timezone offsets

[michaelbrewer]

Issue #, if available:
#324

Description of changes:

Add support for Scalar types in AWS AppSync

• Move existing scalar util functions in to scalar_types_utils.py
• Add support for timezone offset
• Add docstrings for scalar utils
• Update tests

Example usage:

>>> from aws_lambda_powertools.utilities.data_classes.appsync import scalar_types_utils
>>>
>>> scalar_types_utils.make_id()
'1e090fce-3798-40eb-b752-3664a39b0f34'
>>> scalar_types_utils.aws_date(timezone_offset=2)
'2021-03-14+02:00:00'
>>> scalar_types_utils.aws_time(timezone_offset=-1)
'23:33:58-01:00:00'

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

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[michaelbrewer]

@heitorlessa i moved the scalar related utils into scalar_types_utils.py and added support for timezone offsets :)

[heitorlessa]

Timezone offset is a nice touch - Thanks a lot for working on it!