Add key type to internal relation keys in pg_tde: #317
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This commit introduces a key type to internal relation keys, allowing segregation of SMGR and heap_basic internal keys. It resolves the issue of double encryption when both tde_heap and tde_heap_basic access methods are in use.
With this enhancement, pg_tde now supports three types of internal keys: SMGR keys, heap_basic keys, and global keys, improving flexibility and preventing redundant encryption operations.