Track top-level module imports in the semantic model #24405

Job	Run time
Determine changes	7s
pre-commit	1m 5s
python package	1m 9s
cargo fmt	12s
mkdocs	2m 11s
cargo test (windows)	6m 3s
cargo test (wasm)	1m 13s
cargo clippy	1m 43s
cargo test (linux)	4m 12s
cargo udeps	1m 54s
cargo fuzz	5m 15s
formatter instabilities and black similarity	0s
test scripts	55s
benchmarks	6m 24s
ecosystem	8m 49s
test ruff-lsp	31s
	41m 43s

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