[Summary] integrate new module PD into hugegraph

[VGalaxies]

subtask of #2265

• license header
  • fix(pd-store): correct license in hugegraph-pd #2446
• CI
  • fix(pd-store): intro Useless annotation & refactor and mark the failed tests in hg-pd-test #2480
  • chore(pd): refactor and fix pd tests #2492
• to master
  • chore(pd-store-dev): integrate pd-grpc, pd-common, pd-client into hugegraph #2460
  • feat(pd): integrate pd-grpc&pd-common&pd-client #2498
  • feat(pd): integrate pd-core into hugegraph #2478
  • feat(pd): integrate pd-service into hugegraph #2528
  • feat(pd): integrate pd-dist into hugegraph & add core tests, client tests, and REST tests for PD #2532
  • chore(pd): translate CJK comments to English #2536

[dosubot]

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