test

Add bm_base64 covering common base64 module APIs #2373

Job	Run time
ubuntu-latest - 3.11	8m 29s
ubuntu-latest - 3.14	8m 28s
ubuntu-latest - 3.12	8m 30s
ubuntu-latest - 3.10	7m 18s
ubuntu-24.04-arm - 3.10	6m 29s
ubuntu-latest - 3.15-dev	7m 31s
ubuntu-latest - pypy-3.11	14m 1s
ubuntu-latest - 3.15-dev free-threading	8m 37s
ubuntu-24.04-arm - 3.13	6m 53s
ubuntu-24.04-arm - 3.14 free-threading	7m 15s
macos-latest - 3.14	6m 32s
ubuntu-24.04-arm - 3.14	7m 24s
ubuntu-24.04-arm - 3.11	7m 14s
ubuntu-24.04-arm - 3.12	7m 28s
windows-latest - 3.14	13m 0s
ubuntu-latest - 3.13	8m 54s
ubuntu-latest - 3.14 free-threading	8m 40s
	2h 22m 43s

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