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LUD-19: Pay link discoverable from withdraw link.

author: akumaigorodski discussion: https://t.me/lnurl/12568

Merging "pay" and "withdraw" related to a same SERVICE in a WALLET

LNURL-withdraw may contain a payLink in its JSON response. This is done to recognize a fact that SERVICE may want to allow both deposits and withdrawals to user account and as such make a static payment link easily discoverable from withdraw link.

When WALLET sees this it may store and show a compound item to user which would allow to both deposit and withdraw (and also to show an up-to-date SERVICE balance if LNURL-withdraw contains a balanceCheck field).

Modification required in SERVICE callback JSON of LNURL-withdraw:

 {
   "tag": "withdrawRequest",
   "callback": string,
   "k1": string,
   "defaultDescription": string,
   "minWithdrawable": number,
   "maxWithdrawable": number,
   "balanceCheck": string,
+  "payLink": string
 }

payLink is raw URL (not bech32-encoded) as described in LUD-17.