feat: Endorsement Certificates #336

Job	Run time
lint	2m 36s
test-synapse-sdk (lts/*, windows-latest)	2m 54s
test-synapse-core	54s
test-synapse-sdk (current, windows-latest)	3m 1s
test-synapse-sdk (current, ubuntu-latest)	1m 59s
test-synapse-sdk (current, macos-latest)	4m 10s
test-synapse-sdk (lts/*, macos-latest)	4m 22s
test-synapse-sdk (lts/*, ubuntu-latest)	1m 55s
	21m 51s

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