fix(sdk-api): replace naive keychain batching with FFD bin packing #1526

Job	Run time
Generate head API spec	7m 42s
Generate merge base API spec	1m 19s
Check specs identical	0s
API Spec Check	3s
Generate vacuum reports for API spec	-1s
Check breaking changes	-1s
Linter Override	-1s
Generate merge base API spec	7m 0s
Generate head API spec	7m 42s
Check specs identical	6s
Linter Override	0s
API Spec Check	3s
Generate vacuum reports for API spec	0s
Check breaking changes	0s
	23m 52s

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