Add estimator sample ut, load url from disk #172

Job	Run time
Build python wheels (manylinux_x86_64, 3.10, cp38)	1m 45s
Build python wheels (manylinux_x86_64, 3.10, cp39)	1m 23s
Build python wheels (manylinux_x86_64, 3.10, cp310)	1m 26s
Build python wheels (manylinux_x86_64, 3.10, cp311)	1m 42s
Build python wheels (win_amd64, 3.10, cp38)	4m 41s
Build python wheels (win_amd64, 3.10, cp39)	2m 43s
Build python wheels (win_amd64, 3.10, cp310)	3m 10s
Build python wheels (win_amd64, 3.10, cp311)	2m 52s
Build python wheels (macosx_x86_64, 3.10, cp38)	2m 7s
Build python wheels (macosx_x86_64, 3.10, cp39)	2m 18s
Build python wheels (macosx_x86_64, 3.10, cp310)	2m 9s
Build python wheels (macosx_x86_64, 3.10, cp311)	1m 34s
Build python wheels (macosx_arm64, 3.10, cp38)	4m 4s
Build python wheels (macosx_arm64, 3.10, cp39)	2m 28s
Build python wheels (macosx_arm64, 3.10, cp310)	5m 3s
Build python wheels (macosx_arm64, 3.10, cp311)	1m 35s
	41m 0s

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