test

Add bm_base64 covering common base64 module APIs #2374

Job	Run time
ubuntu-24.04-arm - 3.14	1m 42s
ubuntu-latest - 3.15-dev	2m 3s
ubuntu-latest - 3.12	1m 49s
ubuntu-24.04-arm - 3.11	1m 40s
ubuntu-latest - 3.10	1m 52s
ubuntu-latest - 3.15-dev free-threading	2m 24s
ubuntu-latest - 3.11	1m 54s
ubuntu-24.04-arm - 3.10	1m 38s
ubuntu-latest - 3.13	1m 44s
ubuntu-24.04-arm - 3.13	1m 41s
ubuntu-24.04-arm - 3.12	1m 40s
macos-latest - 3.14	1m 35s
ubuntu-latest - pypy-3.11	1m 26s
ubuntu-24.04-arm - 3.14 free-threading	1m 43s
windows-latest - 3.14	1m 42s
ubuntu-latest - 3.14 free-threading	1m 50s
ubuntu-latest - 3.14	1m 50s
	30m 13s

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