Add additional types for prototype Starport Module

[syan095]

The Prototype Starport module has been added to the Mandala Runtime. For the Polkadot.js website to work, additional types will need to be added to interface with the Mandala chain.

There's a new "CASH" TokenSymbol with the value of 140

"TokenSymbol": {
  "_enum": {
   ....
    "CASH": 140
  }
},

There are also some additional Datatypes and Enums that needs to be added.

"CashYieldIndex": "u128",
"GatewayNoticePayload": {
 "_enum": {
   "SetSupplyCap": "(CurrencyId, Balance)",
   "ChangeAuthorities": "Vec<CompoundAuthoritySignature>",
   "Unlock": "(CurrencyId, Balance, AccountId)",
   "SetFutureYield": "(Balance, CashYieldIndex, Moment)"
 }
},
"GatewayNotice": {
 "id": "u64",
 "payload": "GatewayNoticePayload"
},
"CompoundAuthoritySignature": "AccountId"

[syan095]

For reference the PR for the starport module:
AcalaNetwork/Acala#1099