Add `wait_for_block` method #1219

Job	Run time
find-tests	5s
run (nightly-2024-03-05, x86_64-unknown-linux-gnu, ubuntu-latest, tests/e2e_tests/test_incentive.py)	12m 32s
run (nightly-2024-03-05, x86_64-unknown-linux-gnu, ubuntu-latest, tests/e2e_tests/test_subtensor_...	9m 48s
run (nightly-2024-03-05, x86_64-unknown-linux-gnu, ubuntu-latest, tests/e2e_tests/test_liquid_alp...	8m 19s
run (nightly-2024-03-05, x86_64-unknown-linux-gnu, ubuntu-latest, tests/e2e_tests/test_root_set_w...	10m 25s
run (nightly-2024-03-05, x86_64-unknown-linux-gnu, ubuntu-latest, tests/e2e_tests/test_metagraph.py)	8m 34s
run (nightly-2024-03-05, x86_64-unknown-linux-gnu, ubuntu-latest, tests/e2e_tests/test_neuron_cer...	9m 42s
run (nightly-2024-03-05, x86_64-unknown-linux-gnu, ubuntu-latest, tests/e2e_tests/test_transfer.py)	8m 56s
run (nightly-2024-03-05, x86_64-unknown-linux-gnu, ubuntu-latest, tests/e2e_tests/test_commit_wei...	11m 20s
run (nightly-2024-03-05, x86_64-unknown-linux-gnu, ubuntu-latest, tests/e2e_tests/test_axon.py)	9m 12s
run (nightly-2024-03-05, x86_64-unknown-linux-gnu, ubuntu-latest, tests/e2e_tests/test_dendrite.py)	10m 5s
	1h 38m 58s

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