Add support for "runtime" values #978

Job	Run time
Docs (rinja)	22s
Docs (rinja_derive)	23s
DevSkim	39s
Audit	19s
Book	5s
Docs (rinja_parser)	13s
Jinja2-Assumptions	19s
Rustfmt	15s
Typos	25s
Check order in Cargo.toml	7s
Package (examples/actix-web-app)	1m 6s
MSRV	21s
Package (examples/axum-app)	45s
Test (ubuntu-latest, stable)	46s
Package (examples/poem-app)	50s
Test (ubuntu-latest, beta)	39s
Package (examples/rocket-app)	1m 16s
Package (examples/salvo-app)	1m 12s
Test (macos-latest, stable)	48s
Package (examples/warp-app)	1m 1s
Test (windows-latest, stable)	1m 51s
Package (fuzzing)	53s
Package (rinja)	43s
Package (rinja_derive)	25s
Package (rinja_derive_standalone)	48s
Package (rinja_parser)	41s
Package (testing)	1m 10s
Package (testing-alloc)	29s
Package (testing-no-std)	30s
Cluster-Fuzz	14m 6s
Fuzz (all)	58s
Fuzz (filters)	59s
Fuzz (html)	1m 2s
Fuzz (parser)	1m 2s
	37m 28s

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