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Add support for decoding CoW Swap orders (#1299)

- Adds `SwapOrderMapper` – this mapper will attempt to decode transactions that represent a `preSignature` CoW Swap order.
- Successful decoding depends on multiple conditions. If any of the following conditions occurs, the transaction is mapped to a custom transaction instead (i.e.: without any decoding in place):
  * Transaction data is null
  * Order UID cannot be retrieved
  * Buy or Sell token info cannot be retrieved
  * Unsupported order statuses (statuses which are not `fulfilled`, `open`, `cancelled` or `expired`).
- Adds an `orderBuilder` to support creating multiple instances of `Order` with different properties.
- The decoding of CoW Swap orders is only available if `FF_SWAPS_DECODING` is enabled.

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