test: sqlness upgrade compatibility tests (#5126)

* feat: simple version switch

* chore: remove debug print

* chore: add common folder

* tests: add drop table

* feat: pull versioned binary

* chore: don't use native-tls

* chore: rm outdated docs

* chore: new line

* fix: save old bin dir

* fix: switch version restart all node

* feat: use etcd

* fix: wait for election

* fix: normal sqlness

* refactor: hashmap for bin dir

* test: past 3 major version compat crate table

* refactor: allow using without setup etcd

tests/conf/metasrv-test.toml.template

@@ -1,4 +1,14 @@
 flush_stats_factor = 1
+{{ if use_etcd }}
+## Store server address default to etcd store.
+store_addrs = [{store_addrs | unescaped}]
+
+## Store data in memory.
+use_memory_store = false
+
+## The datastore for meta server.
+backend = "EtcdStore"
+{{ endif }}
 [wal]
 {{ if is_raft_engine }}
 provider = "raft_engine"