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f43bfd69 - GH-36770: [C++] Use custom endpoint for s3 using environment variable AWS_ENDPOINT_URL (#36791)

GH-36770: [C++] Use custom endpoint for s3 using environment variable AWS_ENDPOINT_URL (#36791) ### Rationale for this change we need a way to read custom object storage (such as minio host or other s3-like storage). use environment variable `AWS_ENDPOINT_URL ` ### What changes are included in this PR? set variable endpoint_override according the environment variable ### Are these changes tested? unittest and tested on pyarrow ### Are there any user-facing changes? No * Closes: #36770 Authored-by: yiwei.wang <yiwei.wang@weride.ai> Signed-off-by: Sutou Kouhei <kou@clear-code.com>