feat: use EncodableSignature for tx encoding #3334

Job	Run time
doctest	3m 47s
clippy	40s
feature-checks	3m 23s
no-std	15s
test ubuntu-latest stable --no-default-features	1m 16s
wasm-unknown	46s
wasm-wasi	1m 21s
test ubuntu-latest stable	1m 26s
test ubuntu-latest nightly --no-default-features	2m 52s
cfg-check	1m 18s
test ubuntu-latest nightly	2m 46s
docs	1m 58s
test ubuntu-latest 1.76 --no-default-features	41s
fmt	14s
test ubuntu-latest 1.76	1m 15s
test windows-latest stable --no-default-features	3m 46s
test windows-latest stable	4m 59s
test windows-latest nightly --no-default-features	6m 26s
test windows-latest nightly	6m 28s
test windows-latest 1.76 --no-default-features	2m 40s
test windows-latest 1.76	3m 51s
	52m 8s

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