cloudflare[minor]: Adds Cloudflare D1 checkpointer #14900

Job	Run time
Check linting	3m 25s
platform-compatibility (ubuntu-latest)	4m 56s
platform-compatibility (windows-latest)	18m 45s
platform-compatibility (macos-latest)	7m 18s
test-exports / exports-esbuild	6m 41s
test-exports / exports-esm	6m 34s
test-exports / exports-cf	6m 26s
test-exports / exports-cjs	6m 33s
test-exports / exports-vercel	7m 44s
test-exports / exports-tsc	5m 59s
test-exports / exports-vite	6m 1s
	1h 20m 22s

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