GH-48846: [C++] Optimize ReadMessage to read metadata and body in one go #48975
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Rationale for this change
ReadMessageAsync takes a body_length parameter and reads Message metadata + body in one go, but the blocking version ReadMessage reads the body length from the Message and issues a second read for the body. This PR adds a ReadMessage overload that takes the body length as parameter and does a single read like the async version does.
What changes are included in this PR?
Are these changes tested?
Yes, added TestReadMessage.ReadBodyWithLength and updated other tests to use the new overload.
Are there any user-facing changes?
No.