fix(sdk-api): replace naive keychain batching with FFD bin packing #1525

Job	Run time
Generate merge base API spec	8m 10s
Generate head API spec	8m 12s
Check specs identical	8s
Generate vacuum reports for API spec	0s
Check breaking changes	-1s
Linter Override	-1s
API Spec Check	4s
	16m 32s

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