[CoreInternal] Add async flush method #1273

Job	Run time
catalyst	4m 1s
spm-package-resolved	1m 24s
pod-lib-lint (ios, macos-14, Xcode_15.2)	6m 57s
pod-lib-lint (ios, macos-14, Xcode_16)	13m 35s
pod-lib-lint (tvos, macos-14, Xcode_15.2)	5m 25s
pod-lib-lint (tvos, macos-14, Xcode_16)	5m 58s
pod-lib-lint (macos, macos-14, Xcode_15.2)	3m 41s
pod-lib-lint (macos, macos-14, Xcode_16)	3m 40s
pod-lib-lint (watchos, macos-14, Xcode_15.2)	1m 15s
pod-lib-lint (watchos, macos-14, Xcode_16)	3m 35s
spm (macos-13, Xcode_15.2, iOS)	4m 17s
spm (macos-14, Xcode_15.4, iOS)	8m 15s
spm (macos-15, Xcode_16, iOS)	1m 59s
spm (macos-15, Xcode_16, tvOS)	1m 36s
spm (macos-15, Xcode_16, macOS)	1m 19s
spm (macos-15, Xcode_16, watchOS)	1m 40s
spm (macos-15, Xcode_16, catalyst)	1m 31s
spm (macos-15, Xcode_16, visionOS)	1m 56s
core-internal-cron-only	0s
	1h 12m 4s

Provide feedback