Externalize SQL queries

Port of runelite/runelite#8740

Perhaps a rather minor thing, but I only mention it because code is otherwise very clean.

SQL queries (e.g. https://github.com/runelite/runelite/blob/master/http-service/src/main/java/net/runelite/http/service/loottracker/LootTrackerService.java) can be moved into xml file inside src/main/resources, and then read using standard java properties.

E.g.: src/main/resources/sql/loottracker.sql:

<properties>
    <entry key="createTable">
    <![CDATA[
        CREATE TABLE ....
    ]]>
    </entry>
</properties>

and then inside service file:

Properties sqlProperties = new Properties();
sqlProperties.loadFromXML(new ClassPathResource("sql/loottracker.sql").getInputStream());
String createTableQuery = sqlProperties.getProperty("createTable");

Start with http-service/src/main/java/net/runelite/http/service/loottracker/LootTrackerService.java and review the proposed src/main/resources/sql/loottracker.sql format. Identify the SQL queries in the service, externalize them as XML properties, and update the service to load them from the classpath. Done means the service uses the externalized queries without changing its behavior.