Rust

Move `Count` to `functions-aggregate`, update MSRV to rust 1.75 #26785

Job	Run time
cargo check	3m 9s
build with wasm-pack	2m 18s
cargo test (win64)	10m 59s
cargo test (macos)	4m 27s
Check cargo fmt	45s
cargo test (macos-aarch64)	6m 0s
Verify MSRV (Min Supported Rust Version)	4m 14s
Verify Vendored Code	1m 9s
cargo examples (amd64)	7m 41s
cargo test (amd64)	6m 38s
cargo doc	2m 16s
clippy	4m 58s
cargo test hash collisions (amd64)	6m 43s
cargo test datafusion-cli (amd64)	3m 27s
cargo test doc (amd64)	6m 47s
Run sqllogictest with Postgres runner	3m 13s
cargo test pyarrow (amd64)	2m 24s
verify benchmark results (amd64)	10m 13s
check Cargo.toml formatting	2m 53s
check configs.md is up-to-date	2m 40s
	1h 32m 54s

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