Create docs for the TS SDK's `queryEvents` and `queryTransactionBlocks`

Please add simple usage example for the [`queryEvents`](/iota-api-ref#iotax_queryevents) and [`queryTransactionBlocks`](/iota-api-ref#iotax_querytransactionblocks) methods, and add a link to the snippet added in https://github.com/iotaledger/iota/pull/5120.