CBG-4257 implement more parts of CouchbaseLiteMockPeer #12469

Job	Run time
lint	1m 52s
python-format	8s
addlicense	17s
build	1m 21s
python-lint	7s
test (macos)	5m 22s
test-race	5m 58s
test (windows)	6m 44s
test-default-collection	4m 25s
test-sgcollect (macos-latest)	50s
test (ubuntu)	4m 50s
test-stats-definition-exporter (macos-latest)	1m 15s
test-sgcollect (windows-latest)	4m 2s
test-stats-definition-exporter (windows-latest)	2m 14s
test-sgcollect (ubuntu-latest)	22s
test-stats-definition-exporter (ubuntu-latest)	1m 15s
	41m 2s

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