Add support for strict-send and strict-receive paths end-point.

[abuiles]

This PR adds support for /paths/strict-send and /paths/strict-receive and deprecates server.paths

Add ➕

server.strictSendPaths

This request allows you to answer questions like "Get me the most EUR possible for my 10 USD".

This functions takes the asset you want to send, the amount and a list of assets or alternatively the destination address.

You can call it passing a list of assets as destination:

server.strictSendPaths(sourceAsset, sourceAmount, [destinationAsset]).call()

Or an Stellar account address:

server.strictSendPaths(sourceAsset, sourceAmount, "GDRREYWHQWJDICNH4SAH4TT2JRBYRPTDYIMLK4UWBDT3X3ZVVYT6I4UQ").call()

server.strictReceivePaths

This request allows you to answer questions like "How much EUR do it to send 10 USD?".

You can call it passing a list of source assets:

server.strictReceivePaths(sourceAssets,destinationAccount,destinationAsset, destinationAmount)

Or a by passing a Stellar source account address:

server.strictReceivePaths(sourceAccount,destinationAccount,destinationAsset, destinationAmount)

When you call this function with a Stellar account address, it will look at the account’s trustlines and use them to determine all payment paths that can satisfy the desired amount.

Deprecated ⚠️

• Server#paths is deprecated in favor of Server#strictReceivePaths

[morleyzhi]

LGTM!

[rice2000]

Looks good! Just left a few small copy editing suggestions.

[rice2000]

LGTM!