Add method to ISwapsApi for fetching orders by transaction hash

[iamacook]

Summary

Transfers returned by the Transaction Service do not contain the data of the relative transaction. This means that the transaction cannot be decoded to detect the settle call. As such, we need to fetch the order of a transaction by transaction hash.

This adds a new ISwapsApi['getOrders'] method that accepts the transaction hash, fetching the order book from CoW accodingly.

Changes

• Add ISwapsApi['getOrders'] and implementation
• Add ISwapsRepository['getOrders'] and validated implementation

[coveralls]

Pull Request Test Coverage Report for Build 9661310817

Details

• 2 of 10 (20.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 48.671%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/domain/swaps/swaps.repository.ts	1	4	25.0%
src/datasources/swaps-api/cowswap-api.service.ts	0	5	0.0%

Totals
Change from base Build 9653411332:	-0.04%
Covered Lines:	4108
Relevant Lines:	6808

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💛 - Coveralls