[Pod] Define interface for TableLogBufferFactory.

This CL:
1) Splits TableLogBufferFactory into an interface and an implementation
2) Puts the interface into a pod so other pods can use the factory

For now, the implementation is still in the monolith.

Bug: 307607958
Test: mp sysuig, then dump table buffers -> verify they still have
content
Flag: EXEMPT refactor

Change-Id: I86d158b93df595d1d555b3cf4792dcaadf4af80f