Add dynamically loading table credentials support for unity delta write #60

Job	Run time
build packages	12s
code-quality	1m 14s
Check if MotherDuck v0.10.x token exists	1s
Buena Vista functional test / python 3.9	3m 30s
file-based functional test / python 3.8	3m 4s
fsspec test / python 3.9	57s
functional test / python 3.8	2m 54s
file-based functional test / python 3.9	3m 8s
functional test / python 3.9	2m 43s
file-based functional test / python 3.10	3m 7s
plugins test / python 3.9	1m 6s
functional test / python 3.10	2m 40s
file-based functional test / python 3.11	2m 44s
unit test / python 3.8	1m 3s
unit test / python 3.9	1m 2s
functional test / python 3.11	2m 27s
Unity Catalog functional test / python 3.9	3m 13s
unit test / python 3.10	1m 4s
unit test / python 3.11	1m 7s
MotherDuck functional test / python ${{ matrix.python-version }}	0s
verify packages / python 3.8 / ubuntu-latest	43s
verify packages / python 3.9 / ubuntu-latest	32s
verify packages / python 3.10 / ubuntu-latest	33s
verify packages / python 3.11 / ubuntu-latest	28s
verify packages / python 3.8 / macos-latest	55s
verify packages / python 3.9 / macos-latest	30s
verify packages / python 3.10 / macos-latest	24s
verify packages / python 3.11 / macos-latest	24s
verify packages / python 3.8 / windows-latest	1m 36s
verify packages / python 3.9 / windows-latest	1m 8s
verify packages / python 3.10 / windows-latest	1m 20s
verify packages / python 3.11 / windows-latest	1m 18s
	47m 7s

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