Maintain source info in the database. (#6389)

* Maintain Source Info in database

* Review changes and cleanups

* Review changes 2

* Review Changes 3

app/src/main/sqldelight/data/sources.sq

@@ -0,0 +1,20 @@
+CREATE TABLE sources(
+    _id INTEGER NOT NULL PRIMARY KEY,
+    lang TEXT NOT NULL,
+    name TEXT NOT NULL
+);
+
+getSourceData:
+SELECT *
+FROM sources
+WHERE _id = :id;
+
+upsert:
+INSERT INTO sources(_id, lang, name)
+VALUES (:id, :lang, :name)
+ON CONFLICT(_id)
+DO UPDATE
+SET
+    lang = :lang,
+    name = :name
+WHERE _id = :id;