feat(`provider`): `eth_getAccount` support #2437

Job	Run time
doctest	2m 19s
cfg-check	34s
clippy	58s
docs	1m 9s
feature-checks	3m 26s
fmt	10s
no-std	25s
wasm-unknown	1m 2s
test ubuntu-latest stable --no-default-features	1m 55s
wasm-wasi	1m 27s
test ubuntu-latest stable	1m 59s
test ubuntu-latest nightly --no-default-features	1m 15s
test ubuntu-latest nightly	1m 25s
test ubuntu-latest 1.76 --no-default-features	1m 17s
test ubuntu-latest 1.76	1m 9s
test windows-latest stable --no-default-features	5m 46s
test windows-latest stable	6m 30s
test windows-latest nightly --no-default-features	3m 50s
test windows-latest nightly	4m 0s
test windows-latest 1.76 --no-default-features	3m 19s
test windows-latest 1.76	3m 24s
test ubuntu-latest stable --all-features	2m 21s
test ubuntu-latest nightly --all-features	1m 58s
	51m 38s

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