fix(pd): populate memberSize in GET / endpoint response#3003

caglareker wants to merge 3 commits intoapache:masterapache/hugegraph:masterfrom

caglareker:fix/issue-3002-bug-get-endpoint-always-returns-membersicaglareker/hugegraph:fix/issue-3002-bug-get-endpoint-always-returns-membersiCopy head branch name to clipboard