fix: support to compat the old layered memtable options #1568
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Rationale
We introduce the explicit flag to control should we enable layered memtable, but it has some compatibility problem when upgrading from old version.
This pr add an option to support compating the old layered memtable on/off control method.
Detailed Changes
Add an option to support compating the old layered memtable on/off control method.
Test Plan
Manually.