feat(backup): 2. update and refactor meta backup engine class #2142
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This pr removes some previous backup implementation, because the enhancement code is strongly different with the current one. Besides, this pr also disable related unit tests and function tests.
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What problem does this PR solve?
#1945
As the issue shows, meta_backup_engine will intertact with replica server and contorl backup lifecycle and status switch. This pr is the first part about it, including:
1.update init_backup and start functions
2.update backup_status and backup_item structures
3.update varieties of meta_backup_engine.h
4.rename backup_engine into meta_backup_engine
5.refactor meta_backup_engine.h including public/private, function definition order etc.