test

Add bm_base64 covering common base64 module APIs #2376

Job	Run time
ubuntu-24.04-arm - 3.13	6m 55s
ubuntu-latest - 3.15-dev	7m 11s
ubuntu-latest - 3.13	8m 27s
ubuntu-latest - 3.14	8m 45s
ubuntu-latest - 3.12	8m 35s
windows-latest - 3.14	14m 11s
ubuntu-latest - 3.15-dev free-threading	8m 26s
ubuntu-latest - 3.14 free-threading	7m 59s
macos-latest - 3.14	9m 32s
ubuntu-24.04-arm - 3.14 free-threading	7m 37s
ubuntu-24.04-arm - 3.11	7m 30s
ubuntu-24.04-arm - 3.14	7m 10s
ubuntu-latest - 3.11	8m 25s
ubuntu-latest - 3.10	7m 25s
ubuntu-24.04-arm - 3.12	7m 30s
ubuntu-24.04-arm - 3.10	6m 33s
ubuntu-latest - pypy-3.11	13m 46s
	2h 25m 57s

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