Add dynamically loading table credentials support for unity delta write #62

Job	Run time
code-quality	1m 26s
functional test / python 3.8	2m 56s
functional test / python 3.9	2m 48s
build packages	13s
Buena Vista functional test / python 3.9	10m 1s
functional test / python 3.10	2m 48s
Check if MotherDuck v0.10.x token exists	1s
functional test / python 3.11	2m 25s
file-based functional test / python 3.8	3m 25s
fsspec test / python 3.9	1m 1s
file-based functional test / python 3.9	3m 9s
plugins test / python 3.9	1m 4s
unit test / python 3.8	1m 4s
file-based functional test / python 3.10	3m 5s
file-based functional test / python 3.11	2m 43s
unit test / python 3.9	1m 11s
unit test / python 3.10	1m 5s
Unity Catalog functional test / python 3.9	3m 4s
unit test / python 3.11	59s
MotherDuck functional test / python ${{ matrix.python-version }}	0s
verify packages / python 3.8 / ubuntu-latest	39s
verify packages / python 3.9 / ubuntu-latest	35s
verify packages / python 3.10 / ubuntu-latest	28s
verify packages / python 3.11 / ubuntu-latest	36s
verify packages / python 3.8 / macos-latest	1m 4s
verify packages / python 3.9 / macos-latest	31s
verify packages / python 3.10 / macos-latest	25s
verify packages / python 3.11 / macos-latest	25s
verify packages / python 3.8 / windows-latest	2m 20s
verify packages / python 3.9 / windows-latest	1m 8s
verify packages / python 3.10 / windows-latest	1m 29s
verify packages / python 3.11 / windows-latest	2m 6s
	56m 14s

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