Migrate gdb/scripts/ to platform007
Migrate gdb/scripts/ to platform007

Summary: [GDB] Migrate `gdb/scripts/` to `platform007`.

Reviewed By: pixelb

Differential Revision: D14400956

fbshipit-source-id: 59f800c8770fae78ffd51d33161bb56dc6c9ff12

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly