Tie `SessionId` to `SessionParameters::Digest` #45

Job	Run time
clippy	27s
build (1.81.0, wasm32-unknown-unknown)	26s
build-docs	33s
coveralls	44s
build (stable, wasm32-unknown-unknown)	25s
rustfmt	12s
semver	21s
tests (x86_64-unknown-linux-gnu, stable)	35s
	3m 43s

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