Add const to BufFileWrite

Peter Eisentraut <peter@eisentraut.org>

Commit: faf3750657a8271e2a28c054fd83e47302ac1eb4
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-12-30T09:12:24Z
Releases: 16.0
Add const to BufFileWrite

Make data buffer argument to BufFileWrite a const pointer and bubble
this up to various callers and related APIs.  This makes the APIs
clearer and more consistent.

Discussion: https://www.postgresql.org/message-id/flat/11dda853-bb5b-59ba-a746-e168b1ce4bdb%40enterprisedb.com

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