Rust

Clarify docs explaining the relationship between `SessionState` and `SessionContext` #26295

Job	Run time
build with wasm-pack	2m 20s
cargo check	6m 20s
cargo test (win64)	38m 37s
cargo test (macos-aarch64)	10m 3s
Check cargo fmt	41s
cargo test (macos)	10m 38s
Verify MSRV (Min Supported Rust Version)	6m 25s
Verify Vendored Code	58s
cargo test datafusion-cli (amd64)	3m 39s
cargo examples (amd64)	11m 0s
cargo test (amd64)	11m 31s
check Cargo.toml formatting	2m 53s
clippy	4m 45s
check configs.md is up-to-date	2m 30s
cargo test hash collisions (amd64)	10m 30s
cargo doc	3m 38s
cargo test doc (amd64)	11m 29s
Run sqllogictest with Postgres runner	3m 17s
cargo test pyarrow (amd64)	2m 46s
verify benchmark results (amd64)	10m 9s
	2h 34m 9s

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