By Molly Cone TORONTO, March 22 (Reuters) - When the Bank of Canada became the first major global central bank this month to pause raising interest rates after its most aggressive tightening campaign in history, indebted consumers heaved a sigh of relief. The Royal Bank of Canada's consumer spending tracker released on March 9 showed discretionary spending "held up" in February, driven by air travel demand. But restaurant spending edged lower while rising grocery inflation sapped spending power.