Switch ArrowDict to signed and fix static datatype #12721

Job	Run time
cpp-paths-filter	3s
docs-paths-filter	4s
python-paths-filter	5s
rust-paths-filter	4s
web-paths-filter	6s
Checks / Test Python Docs	28s
Checks / Rerun lints	32s
Checks / Check if running codegen would produce any changes	1m 26s
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Update PR Body / Update PR body	23s
C++ tests	0s
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Rust Checks / Test on macOS and Windows	0s
Rust Checks / Rust lints (fmt, check, clippy, tests, doc)	42m 13s
Build web viewer / Build web viewer	3m 29s
Build rerun_js / Build rerun_js	3m 53s
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Minimum Wheel Build / Set Config (linux-x64)	2s
Minimum Wheel Build / Build Wheels (ubuntu-latest-16-cores)	2m 18s
Minimum Wheel Test / Set Config (linux-x64)	3s
Minimum Wheel Test / Test Wheels (ubuntu-latest-16-cores)	3m 38s
	1h 5m 50s

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