DAOS-15681 bio: store scm_sz in SMD

[NiuYawei]

In md-on-ssd phase 2, the scm_sz (VOS file size) could be smaller than the meta_sz (meta blob size), then we need to store an extra scm_sz in SMD, so that on engine start, this scm_sz could be retrieved from SMD for VOS file re-creation.

To make the SMD compatible with pmem & md-on-ssd phase 1, a new table named "meta_pool_ex" is introduced for storing scm_sz.

Required-githooks: true

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[github-actions[bot]]

Ticket title is 'BIO & SMD changes for extra scm_size' Status is 'In Review' Labels: 'md_on_ssd2' https://daosio.atlassian.net/browse/DAOS-15681

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