Support DEX orders on stellar client

[AlaaElattar]

Description

• support placing, canceling, and listing orders

Changes

• Added createOrder, user can create buy/sell orders for specific assets.
• Added cancelOrder, user can cancel specific order with its id.
• Added getOrderBook, user can get oder book of the conversion between any 2 assets.
• Added listMyOffers, user can list its offers.
• Added updateOrder, user can update an existing offer with its id.

Related Issues

#112

Checklist

• Tests included
• Build pass
• Code format
• Screenshots/Video attached (needed for UI changes)

[zaelgohary]

Please fix analyze workflow. Also, can you replace prints with logger?

[zaelgohary]

I get insufficient balance although I have enough XLMs in my balance.

Also, USDC asset code is not added while adding trustline,

Logger is not working. I had to edit the logger value in client to the following for it to print.

  var logger = Logger(
    printer: PrettyPrinter(
      methodCount: 2,
      errorMethodCount: 8,
      lineLength: 120,
      colors: true,
      printEmojis: true,
    ),
    level: Level.debug,
    filter: ProductionFilter(),
  );

[zaelgohary]

Although I create an order successfully, I get an empty list when listing offers.

[zaelgohary]

I get the following error while updating the order.

[AlaaElattar]

Although I create an order successfully, I get an empty list when listing offers.

• I tried the same behavior and the balance changed.
  

[AlaaElattar]

I get the following error while updating the order.

• The offers list is empty which means the order already done.
• That's why its not found when updating it in the offers.

[zaelgohary]

• Can we add Docs to the PR? Please, don't forget to handle the units we use in creating/updating orders.

• When creating order with price '.0001; I get the following err: (It leads the leading 0. Needs to be mentioned in the docs)

• When creating account through threefold service on Testnet, it failed to add USDC asset.

• Amount before and after create order does not match the price

• I created 4 offers, none of them were listed in the orderbook
  

[zaelgohary]

• Orderbook is not being updated with my offers. It lists only 6 offers. (Maybe it's paginated? idk.).

• I think the getOrderBook docs equation is incorrect.
  

[AlaaElattar]

• Orderbook is not being updated with my offers. It lists only 6 offers. (Maybe it's paginated? idk.).
• I think the getOrderBook docs equation is incorrect.
  

• I check the representation again and what i noticed about stellar representation is :

Total selling amount = Buy amount * price
price = 1 / price

[AlaaElattar]

• Orderbook is not being updated with my offers. It lists only 6 offers. (Maybe it's paginated? idk.).
• I think the getOrderBook docs equation is incorrect.
  

• About the first point of order book, I found that it doesn't support traditional pagination.
• It returns a snapshot of the current order book state. (only limited number of bids and asks)

[zaelgohary]

Good job, @AlaaElattar!