Remove deprecated LogicalPlan::inspect_expressions #287

Job	Run time
build with wasm-pack	2m 33s
cargo check	10m 54s
cargo test (macos)	11m 39s
Check cargo fmt	41s
Verify MSRV (Min Supported Rust Version)	8m 45s
cargo test (macos-aarch64)	10m 52s
Verify Vendored Code	50s
cargo test (win64)	59m 1s
cargo examples (amd64)	13m 46s
cargo doc	4m 0s
cargo test (amd64)	10m 51s
cargo test doc (amd64)	15m 19s
Run sqllogictest with Postgres runner	3m 42s
verify benchmark results (amd64)	12m 17s
cargo test datafusion-cli (amd64)	4m 3s
check Cargo.toml formatting	2m 52s
clippy	5m 57s
cargo test hash collisions (amd64)	16m 52s
check configs.md and ***_functions.md is up-to-date	3m 5s
cargo test pyarrow (amd64)	2m 51s
	3h 20m 50s

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