test

Add bm_base64 covering common base64 module APIs #2377

Job	Run time
ubuntu-24.04-arm - 3.13	7m 15s
ubuntu-latest - 3.12	8m 42s
ubuntu-latest - 3.13	8m 30s
ubuntu-24.04-arm - 3.12	7m 53s
ubuntu-24.04-arm - 3.10	6m 50s
windows-latest - 3.14	14m 11s
ubuntu-24.04-arm - 3.14 free-threading	7m 9s
ubuntu-24.04-arm - 3.11	7m 31s
ubuntu-latest - 3.14 free-threading	8m 8s
ubuntu-latest - 3.15-dev free-threading	9m 21s
ubuntu-latest - 3.14	8m 2s
ubuntu-latest - 3.11	8m 35s
ubuntu-latest - 3.15-dev	7m 42s
ubuntu-latest - 3.10	7m 35s
ubuntu-24.04-arm - 3.14	7m 55s
macos-latest - 3.14	6m 34s
ubuntu-latest - pypy-3.11	13m 43s
	2h 25m 36s

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