feat(consensus): Isthmus Network Upgrade Txs #1332

Job	Run time
cfg-check	17s
clippy	19s
docs	19s
doctest	18s
examples	15s
feature-checks	18s
feature-powerset	24s
fmt	13s
no-std	16s
test stable --no-default-features	45s
wasm-unknown	24s
test stable	23s
wasm-wasi	19s
test stable --all-features	41s
test nightly --no-default-features	23s
test nightly	40s
test nightly --all-features	44s
test 1.81 --no-default-features	49s
test 1.81	51s
	8m 38s

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