feat: generate valid signed auth signatures #3179

Job	Run time
doctest	1m 11s
test ubuntu-latest stable --no-default-features	1m 19s
test ubuntu-latest stable	1m 40s
docs	1m 4s
test ubuntu-latest nightly --no-default-features	1m 18s
test ubuntu-latest nightly	1m 9s
feature-checks	3m 18s
no-std	12s
test ubuntu-latest 1.76 --no-default-features	37s
test ubuntu-latest 1.76	1m 7s
wasm-unknown	39s
test windows-latest stable --no-default-features	5m 38s
wasm-wasi	1m 1s
test windows-latest stable	3m 53s
cfg-check	28s
test windows-latest nightly --no-default-features	3m 36s
clippy	34s
test windows-latest nightly	4m 36s
fmt	12s
test windows-latest 1.76 --no-default-features	4m 36s
test windows-latest 1.76	3m 38s
	41m 46s

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