Merge pull request cnosdb#307 from bartliu827/main

cnosdb-ctl truncate-shards

Merge pull request cnosdb#260 from Gilbert-Liang/Gilbert-testing

add README && add DropDatabaseIsolated case

fix: repair backup and restore not word (cnosdb#227)

* fix(cmd): nil pointer err

* portable

* fix(cmd): backup and restore

* fix(server):si.Owner == nil err

* fix(server): restore shard owner

* fix(server):dataNodeCount == 0, panic

chore(cmd): move cnosdb-cli export to cnosdb_inspect export (cnosdb#197)

feat(C1-6:go client) rename .vendor

feat(C1-6:go client) rename .vendor

fix(server): fix ping http endpoint not available (cnosdb#129)

fix(server): Repair meta node and data node cannot share a meta dir

refactor(*): Remove unnecessary content (cnosdb#15)