Merge pull request #7354 from positiveblue/invoice-sql-schema

sqldb: add invoice schema and sql queries

docs/release-notes/release-notes-0.17.0.md

@@ -6,6 +6,9 @@
   implementation](https://github.com/lightningnetwork/lnd/pull/7377) logic in 
   different update types.
 
+* Add [invoice SQL schema and 
+  queries](https://github.com/lightningnetwork/lnd/pull/7354)
+
 ## Watchtowers 
 
 * Let the task pipeline [only carry