Returns an object containing various wallet state info.

  "walletname": xxxxx,             (string) the wallet name
  "walletversion": xxxxx,          (numeric) the wallet version
  "balance": xxxxxxx,              (numeric) DEPRECATED. Identical to getbalances().mine.trusted
  "unconfirmed_balance": xxx,      (numeric) DEPRECATED. Identical to getbalances().mine.untrusted_pending
  "immature_balance": xxxxxx,      (numeric) DEPRECATED. Identical to getbalances().mine.immature
  "txcount": xxxxxxx,              (numeric) the total number of transactions in the wallet
  "keypoololdest": xxxxxx,         (numeric) the timestamp (seconds since Unix epoch) of the oldest pre-generated key in the key pool
  "keypoolsize": xxxx,             (numeric) how many new keys are pre-generated (only counts external keys)
  "keypoolsize_hd_internal": xxxx, (numeric) how many new keys are pre-generated for internal use (used for change outputs, only appears if the wallet is using this feature, otherwise external keys are used)
  "unlocked_until": ttt,           (numeric) the timestamp in seconds since epoch (midnight Jan 1 1970 GMT) that the wallet is unlocked for transfers, or 0 if the wallet is locked
  "paytxfee": x.xxxx,              (numeric) the transaction fee configuration, set in BCH/kB
  "hdseedid": "<hash160>"          (string, optional) the Hash160 of the HD seed (only present when HD is enabled)
  "private_keys_enabled": true|false (boolean) false if privatekeys are disabled for this wallet (enforced watch-only wallet)
  "scanning":                        (json object) current scanning details, or false if no scan is in progress
      "duration" : xxxx              (numeric) elapsed seconds since scan start
      "progress" : x.xxxx,           (numeric) scanning progress percentage [0.0, 1.0]
  "avoid_reuse": true|false          (boolean) whether this wallet tracks clean/dirty coins in terms of reuse

> bitcoin-cli getwalletinfo 
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getwalletinfo", "params": [] }' -H 'content-type: text/plain;'