DAOS-13564 container: container flatten

[liuxuezhao]

1. control interface of container flatten - daos_cont_set_ro() API definition and implementation property set by "daos cont set-prop --properties=status:readonly ..."
2. container flatten service/ult modification (update/punch) dis-allowed if the epoch is higher than flatten epoch wait until vos agg HAE exceed the flatten epoch, iterate/pack object content destroy obj tree and replace by flattened object
3. read from flattened object singv and array
4. some test cased added (src/tests/suite/daos_obj_flat.c)

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[github-actions[bot]]

Ticket title is 'Object flattening' Status is 'Open' Labels: 'md_on_ssd2' https://daosio.atlassian.net/browse/DAOS-13564

[daosbuild1]

Test stage Functional on EL 8.8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-13924/1/execution/node/1198/log