chore: add `cacheTime` test and fix example link in `getBlockNumber` #1623

Job	Run time
Size	4m 5s
Verify / Lint	50s
Verify / Test (true, http, 1, 3)	1m 32s
Verify / Test Environments (bun)	1m 50s
Verify / Test (true, http, 2, 3)	1m 28s
Verify / Test Environments (node-18)	2m 18s
Verify / Vectors	1m 27s
Verify / Test (true, http, 3, 3)	1m 32s
Verify / Test Environments (node-20)	1m 49s
Verify / Test (true, webSocket, 1, 3)	1s
Verify / Test Environments (node-latest)	2m 13s
Verify / Test (true, webSocket, 2, 3)	1s
Verify / Test Environments (next)	3m 9s
Verify / Test (true, webSocket, 3, 3)	1s
Verify / Test Environments (tsc)	2m 3s
Verify / Test (false, http, 1, 3)	1s
Verify / Test Environments (vite)	2m 31s
Verify / Test (false, http, 2, 3)	1s
Verify / Test (false, http, 3, 3)	1s
Verify / Test (false, webSocket, 1, 3)	1s
Verify / Test (false, webSocket, 2, 3)	1s
Verify / Test (false, webSocket, 3, 3)	1s
Verify / Build	3m 38s
Verify / Types (5.0.4)	1m 48s
Verify / Types (5.1.6)	2m 27s
Verify / Types (5.2.2)	2m 22s
Verify / Types (5.3.3)	3m 7s
Verify / Types (5.4.5)	2m 19s
Verify / Types (5.5.2)	2m 56s
Verify / Wagmi (5.4.5)	4m 56s
Verify / Wagmi (5.5.2)	5m 0s
	55m 29s

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