Create only one provider per type when called multiple on methods in queen bee

src/chain-observers/observer-mediator.ts

src/chain-observers/providers/account-provider.ts

src/chain-observers/providers/alarm-provider.ts

src/chain-observers/providers/mention-provider.ts

src/chain-observers/providers/provider-base.ts

src/chain-observers/providers/rc-account-provider.ts

src/chain-observers/providers/transaction-provider.ts

src/chain-observers/providers/whale-alert-provider.ts

src/chain-observers/providers/witness-provider.ts

src/queen.ts