Switch to using DuckDB's built-in date_diff function for the datediff utils macro #445

Job	Run time
build packages	13s
code-quality	1m 24s
file-based functional test / python 3.8	4m 36s
file-based functional test / python 3.9	4m 16s
file-based functional test / python 3.10	4m 17s
Buena Vista functional test / python 3.9	10m 57s
file-based functional test / python 3.11	3m 48s
fsspec test / python 3.9	1m 1s
functional test / python 3.8	3m 57s
functional test / python 3.9	4m 29s
functional test / python 3.10	4m 5s
functional test / python 3.11	3m 35s
MotherDuck functional test / python 3.9	1m 1s
unit test / python 3.8	53s
plugins test / python 3.9	1m 20s
unit test / python 3.9	56s
unit test / python 3.10	1m 2s
unit test / python 3.11	58s
verify packages / python 3.8 / ubuntu-latest	36s
verify packages / python 3.9 / ubuntu-latest	34s
verify packages / python 3.10 / ubuntu-latest	35s
verify packages / python 3.11 / ubuntu-latest	32s
verify packages / python 3.8 / macos-latest	1m 4s
verify packages / python 3.9 / macos-latest	45s
verify packages / python 3.10 / macos-latest	52s
verify packages / python 3.11 / macos-latest	56s
verify packages / python 3.8 / windows-latest	1m 57s
verify packages / python 3.9 / windows-latest	1m 28s
verify packages / python 3.10 / windows-latest	1m 57s
verify packages / python 3.11 / windows-latest	1m 52s
	1h 5m 56s

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