comp/zstd: fix BIO_CTRL_RESET to properly reset state

comp/zstd: fix BIO_CTRL_RESET to properly reset state

BIO_CTRL_RESET zeroed compress.bufsize and did not reinitialize the ZSTD
streams or buffer positions. After a reset, the next write could try to use
a 0 byte buffer and stall or behave unpredictably.

Signed-off-by: Joshua Rogers <MegaManSec@users.noreply.github.com>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28844)