feat(table_env): Support to list all available table envs

[acelyc111]

Now we can query all available table environments by /envs/list path of meta server, e.g. curl 127.0.0.1:34601/envs/list, the output looks like:

$ curl 127.0.0.1:34601/envs/list
{
  "business.info": {
    "limitation": "",
    "sample": "",
    "type": "string"
  },
  "default_ttl": {
    "limitation": ">= 0",
    "sample": "86400",
    "type": "unsigned int32"
  },
  "manual_compact.disabled": {
    "limitation": "true | false",
    "sample": "true",
    "type": "bool"
  },
  "manual_compact.max_concurrent_running_count": {
    "limitation": ">= 0",
    "sample": "8",
    "type": "unsigned int32"
  },
  "manual_compact.once.bottommost_level_compaction": {
    "limitation": "force | skip",
    "sample": "skip",
    "type": "string"
  },
  "manual_compact.once.target_level": {
    "limitation": "-1 or >= 1",
    "sample": "6",
    "type": "unsigned int64"
  },
  "manual_compact.once.trigger_time": {
    "limitation": "> 0, timestamp (in seconds) to trigger the once manual compaction",
    "sample": "1700000000",
    "type": "unsigned int64"
  },
  "manual_compact.periodic.bottommost_level_compaction": {
    "limitation": "force | skip",
    "sample": "skip",
    "type": "string"
  },
  "manual_compact.periodic.target_level": {
    "limitation": "-1 or >= 1",
    "sample": "6",
    "type": "unsigned int64"
  },
  "manual_compact.periodic.trigger_time": {
    "limitation": "",
    "sample": "",
    "type": "string"
  },
  "replica.backup_request_throttling": {
    "limitation": "<size[K|M]>*<delay|reject>*<milliseconds>",
    "sample": "10000*delay*100,20000*reject*100",
    "type": "string"
  },
  "replica.deny_client_request": {
    "limitation": "timeout*all | timeout*write | timeout*read | reconfig*all | reconfig*write | reconfig*read",
    "sample": "timeout*all",
    "type": "string"
  },
  "replica.read_throttling": {
    "limitation": "<size[K|M]>*<delay|reject>*<milliseconds>",
    "sample": "10000*delay*100,20000*reject*100",
    "type": "string"
  },
  "replica.read_throttling_by_size": {
    "limitation": "",
    "sample": "20000*delay*100,20000*reject*100",
    "type": "string"
  },
  "replica.rocksdb_block_cache_enabled": {
    "limitation": "true | false",
    "sample": "true",
    "type": "bool"
  },
  "replica.rocksdb_iteration_threshold_time_ms": {
    "limitation": ">= 0",
    "sample": "1000",
    "type": "unsigned int64"
  },
  "replica.slow_query_threshold": {
    "limitation": ">= 20",
    "sample": "1000",
    "type": "unsigned int64"
  },
  "replica.split.validate_partition_hash": {
    "limitation": "true | false",
    "sample": "true",
    "type": "bool"
  },
  "replica.write_throttling": {
    "limitation": "<size[K|M]>*<delay|reject>*<milliseconds>",
    "sample": "10000*delay*100,20000*reject*100",
    "type": "string"
  },
  "replica.write_throttling_by_size": {
    "limitation": "<size[K|M]>*<delay|reject>*<milliseconds>",
    "sample": "10000*delay*100,20000*reject*100",
    "type": "string"
  },
  "replica_access_controller.allowed_users": {
    "limitation": "",
    "sample": "",
    "type": "string"
  },
  "replica_access_controller.ranger_policies": {
    "limitation": "",
    "sample": "",
    "type": "string"
  },
  "rocksdb.allow_ingest_behind": {
    "limitation": "true | false",
    "sample": "true",
    "type": "bool"
  },
  "rocksdb.checkpoint.reserve_min_count": {
    "limitation": "> 0",
    "sample": "2",
    "type": "unsigned int32"
  },
  "rocksdb.checkpoint.reserve_time_seconds": {
    "limitation": ">= 0",
    "sample": "3600",
    "type": "unsigned int32"
  },
  "rocksdb.num_levels": {
    "limitation": "In range [1, 10]",
    "sample": "6",
    "type": "unsigned int64"
  },
  "rocksdb.usage_scenario": {
    "limitation": "bulk_load | normal | prefer_write",
    "sample": "normal",
    "type": "string"
  },
  "rocksdb.write_buffer_size": {
    "limitation": "In range [16777216, 536870912]",
    "sample": "16777216",
    "type": "unsigned int64"
  },
  "user_specified_compaction": {
    "limitation": "",
    "sample": "",
    "type": "string"
  }
}

[Smityz]

I will review later