chore(stdlib): Add examples to `Buffer` module #8667

Job	Run time
Build and test on ubuntu-latest / Dependencies / Create dependencies cache	5s
Build and test on macos-latest / Dependencies / Create dependencies cache	7s
Build and test on windows-latest / Dependencies / Create dependencies cache	10s
Build and test on ubuntu-latest / (js) Build and test / (js) Build and test	12m 47s
Build and test on ubuntu-latest / (native) Build and test / (native) Build and test	6m 15s
Build and test on macos-latest / (js) Build and test / (js) Build and test	12m 12s
Build and test on macos-latest / (native) Build and test / (native) Build and test	14m 0s
Build and test on windows-latest / (native) Build and test / (native) Build and test	20m 17s
Build and test on windows-latest / (js) Build and test / (js) Build and test	15m 13s
Test pkg binaries / Test pkg binary on ubuntu-latest	4m 43s
Test pkg binaries / Test pkg binary on macos-latest	4m 55s
Test pkg binaries / Test pkg binary on windows-latest	24s
	1h 31m 8s

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