feat: impl `From<RpcBlockHash>` for `BlockHashOrNumber` #3003

Job	Run time
cfg-check	23s
docs	57s
doctest	59s
clippy	32s
feature-checks	2m 56s
fmt	12s
no-std	13s
test ubuntu-latest stable --no-default-features	1m 23s
wasm-unknown	40s
wasm-wasi	1m 10s
test ubuntu-latest stable	1m 27s
test ubuntu-latest nightly --no-default-features	1m 9s
test ubuntu-latest nightly	1m 19s
test ubuntu-latest 1.76 --no-default-features	40s
test ubuntu-latest 1.76	59s
test windows-latest stable --no-default-features	5m 35s
test windows-latest stable	3m 36s
test windows-latest nightly --no-default-features	3m 44s
test windows-latest nightly	5m 29s
test windows-latest 1.76 --no-default-features	4m 34s
test windows-latest 1.76	3m 4s
	41m 1s

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