WL#9559: InnoDB_New_DD: Support in-place ALTER PARTITION

Affects: Server-8.0   —   Status: Complete

InnoDB now supports the native partitioning which is supposed to rely on
ha_innopart handler. However, for some DDL operations like 'ALTER TABLE ...
PARTITION ...' are not implemented in this way, instead, they are done by
fast_alter_partition_table().

This worklog will support the DDLs mentioned above by in-place APIs of
ha_innopart, not to depend on fast_alter_partition_table() any more.