[close #370] make gRPC and TiKV health check configurable (#369)

[ti-srebot]

cherry-pick #369 to release-3.1
You can switch your code base to this Pull Request by using git-extras:

# In client-java repo:
git pr https://github.com/tikv/client-java/pull/387

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/client-java.git pr/387:release-3.1-2eb77d689197

---

Fix warning in OLAP engine:

2021-12-08 05:18:47,334 WARN  org.tikv.common.region.StoreHealthyChecker                   [] - store [tikv_host:tikv_port] is not reachable
2021-12-08 05:19:01,130 WARN  org.tikv.common.region.AbstractRegionStoreClient             [] - forward request to store [tikv_host:tikv_port] for region[174126738]
2021-12-08 05:19:01,894 WARN  org.tikv.common.region.StoreHealthyChecker                   [] - store [tikv_host:tikv_port] is not reachable
2021-12-08 05:19:01,933 WARN  org.tikv.common.region.StoreHealthyChecker                   [] - store [tikv_host:tikv_port] recovers to be reachable and canforward
2021-12-08 05:19:05,490 WARN  org.tikv.common.region.StoreHealthyChecker                   [] - store [tikv_host:tikv_port] is not reachable
2021-12-08 05:19:05,604 WARN  org.tikv.common.region.StoreHealthyChecker                   [] - store [tikv_host:tikv_port] recovers to be reachable and canforward

[ti-srebot]

/run-all-tests

[marsishandsome]

This is not necessary to cherry pick to 3.1.