Make SPDM_MAX_SLOT_COUNT customizable ?

[lsun100]

With the latest code, struct libspdm_connection_info_t has definition "libspdm_peer_used_cert_chain_t peer_used_cert_chain[SPDM_MAX_SLOT_COUNT]", which increased the context size and has some side-effect on memory-tight devices.

Currently SPDM_MAX_SLOT_COUNT is defined in spdm.h. Would it make sense to move it to spdm_lib_config.h, or add check like
"#ifndef SPDM_MAX_SLOT_COUNT/#define SPDM_MAX_SLOT_COUNT 8/#endif" in spdm.h, so SPDM_MAX_SLOT_COUNT could be customized in Makefile?