Signed-off-by: SkyYang <mooncity.sky@163.com>

* [skip ci](shards): export MAX_WORKERS as configurable parameter
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): skip mishards .env git info
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): support more robust static discovery host configuration
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): update static provider that terminate server if connection to downstream server error during startup
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): add topology.py
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): add connection pool
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): add topology test
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): refactory using topo
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): refactory static discovery using topo
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): refactory kubernetes discovery using topo
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): add more test for connection pool
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): export 19541 and 19542 for all_in_one demo
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): check version on new connection
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): mock connections
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>

* [skip ci](shards): update tests
Signed-off-by: Npeng.xu <peng.xu@zilliz.com>