[THORChainSwap]: Add support for Streaming Swaps

[satoshiotomakan]

Description

THORSwap recently implement streaming swaps. Streamers execute at 99.5% and better, it's recommended to use streaming at 1-block intervals, with the protocol determining the count.

Docs: https://dev.thorchain.org/thorchain-dev/concepts/streaming-swaps

How to test

Types of changes

• Make to_amount_limit optional with the 0 default value
• Add the interval and quantity optional streaming parameters with the 1 and 0 default values correspondingly.

Next

The next and final step is to set the stream_params value in SwapInput on the end-user app side:

        val input = THORChainSwap.SwapInput.newBuilder()
        input.apply {
            fromAsset = THORChainSwap.Asset.newBuilder().apply {
                chain = THORChainSwap.Chain.ETH
            }.build()
            fromAddress = "0xb9f5771c27664bf2282d98e09d7f50cec7cb01a7"
            toAsset = THORChainSwap.Asset.newBuilder().apply {
                chain = THORChainSwap.Chain.BNB
                symbol = "BNB"
                tokenId = ""
            }.build()
            toAddress = "bnb1us47wdhfx08ch97zdueh3x3u5murfrx30jecrx"
            vaultAddress = "0x1091c4De6a3cF09CdA00AbDAeD42c7c3B69C83EC"
            routerAddress = "0x42A5Ed456650a09Dc10EBc6361A7480fDd61f27B"
            fromAmount = "50000000000000000"
            toAmountLimit = "600003" // Now optional
            streamParams = THORChainSwap.StreamParams.newBuilder().apply {
                interval = "1"
                quantity = "0"
            }.build()
            affiliateFeeAddress = "tthor1ql2tcqyrqsgnql2tcqyj2n8kfdmt9lh0yzql2tcqy"
            affiliateFeeRateBp = "10"
        }

Checklist

• Create pull request as draft initially, unless its complete.
• Add tests to cover changes as needed.
• Update documentation as needed.
• If there is a related Issue, mention it in the description.

If you're adding a new blockchain

• I have read the guidelines for adding a new blockchain.