Immutable session backed by `HashMap` #31971

Job	Run time
Python (lint)	38s
Check build with minimal dependencies	2m 2s
Python (test)	2m 18s
Rust (docs)	2m 29s
SQL logic tests	1m 43s
C/C++ (lint)	6s
Rust tests (linux-arm64)	4m 37s
C API test build	36s
Rust (lint, no default)	2m 51s
C++ build	1m 20s
License Check and Audit Check (advisories)	50s
Check generated source files are up to date	45s
WASM integration smoke test	5m 39s
Rust build (with tokio dispatcher)	45s
Rust tests (windows-x64)	7m 31s
lint-toml	7s
License Check and Audit Check (bans licenses sources)	55s
Rust build (all-features)	2m 46s
Java	2m 25s
validate-workflow-yaml	6s
Rust build (wasm32 with default features)	59s
Rust (lint)	2m 11s
Rust build (default features)	2m 36s
	46m 15s

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