Include /transactions endpoint in bridge API

[0xSasaPrsic]

endpoint: /transactions
queryParams: {
	ethAddress?: ""
	availAddress?: ""
	page?: 3
	pageSize?: 25
}
response: {
	result: [
		{
		  sourceChain: "AVAIL", // "ETHEREUM"
		  destinationChain: "ETHEREUM", // "AVAIL"
		  messageId: 24,
		  status:"IN PROGRESS" // "READY_TO_CLAIM" // "CLAIMED" // "FAILED"
		  sourceTransactionHash: "0xabc", 
		  sourceTransactionBlockNumber: 123,
		  sourceTransactionIndex: 2,
		  sourceTransactionTimestamp: date,
		  sourceTokenAddress: "0xabc",
		  destinationTransactionHash: "0xabc",
		  destinationTransactionBlockNumber: 123,
		  destinationTransactionTimestamp: date,
		  destinationTransactionIndex: 123,
		  destinationTokenAddress: "0xabc",
		  depositorAddress: "0xabc",
		  receiverAddress: "0xabc",
		  amount: 1234,
		  message: "0x",
		  dataType: "ERC20",
		  blockHash: "0xabc"
		}, 
		{}
	],
	paginationData: {
		hasNextPage: true
		page: 0
		pageSize: 25
		totalCount: 100
	}
}

[0xSasaPrsic]

@abheektripathy we need additional info about the payload.
query params:

• what should be default values for query params?
• pageSize must have upper bound.
• what are mandatory fields in the response
• how should be handled if the response is optional? null or to remove prop from the response?

[0xSasaPrsic]

PR that supports current indexer implementation: #22

[0xSasaPrsic]

Bridge api merge blocked by availproject/bridge-ui-indexer#7