renames diffsync.DiffSync to diffsync.Adapter #792

Job	Run time
validate_renovate	40s
black	25s
mypy	38s
flake8	33s
bandit	34s
pydocstyle	25s
yamllint	32s
build	1m 14s
pylint	1m 29s
unittest (3.7, 1.5.1)	14s
unittest (3.8, 1.5.1)	28s
unittest (3.9, 1.5.1)	25s
unittest (3.10, 1.5.1)	20s
Publish to GitHub	0s
Push Package to PyPI	0s
Send notification to the Slack	0s
	7m 57s

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