refactor(net): use new `TransactionBuilder`/`NetworkTransactionBuilder` traits #1984

Job	Run time
wasm-wasi	37s
no-std	54s
doctest	39s
feature-checks	44s
wasm-unknown	30s
clippy	34s
docs	31s
test stable --all-features	1m 20s
test nightly	46s
feature-powerset	1m 41s
fmt	13s
test 1.88 --no-default-features	41s
test stable --no-default-features	45s
cfg-check	27s
examples	12s
test 1.88	53s
test stable	47s
test nightly --all-features	1m 36s
test nightly --no-default-features	51s
	14m 41s

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