Add further fields to swap endpoint

[janmichek]

Please add following fields to
/dex/swaps

action: [BUY | SELL | SWAP]
fromContract: [contractId]
toContract: [contractId]
fromAmount: [number]
toAmount: [number]
fromDecimals: [number]
toDecimals: [number]
microtime(of the tx): [time]
height (of the tx): [number]

also please document the API docs

[vatanasov]

@janmichek can you elaborate on:

1. What do you mean by the action field? Which swaps do you consider buy/sell?
2. With fromContract and toContract do you mean the sender and receiver accountPK?

[janmichek]

1. What do you mean by the `action` field? Which swaps do you consider buy/sell?

I think you will get it by the entrypoint swap_exact_ae_for_tokens in this case th_2MZcRcm9Rcjf6HFoxjtHgPVAQSLurLQSFqJ6zjZew5sk7jPU7u

2. With `fromContract` and `toContract` do you mean the sender and receiver accountPK?

By this I mean the token contract adresses