Externalize SQL queries

[LlemonDuck]

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");