Apple (AAPL) is set to report quarterly earnings after the bell on Thursday in what Wall Street expects to be a third straight period of sliding revenue as sales dip for the iPhone and other marquee hardware. The $3 trillion tech giant will offer further insight into global consumer demand and another window into the performance of a US tech sector grappling with inflation and higher interest rates. Apple is coming off two straight quarters of declining revenue as Mac and iPad sales have flagged. But boosted international demand for the flagship iPhone have proven Apple's resilience, alongside a services…