Add custom ANTLR template to avoid Maven Replacer plugin

[mp911de]

ANTLR attempts to load a template via new File(…) before using its classpath. With that, we can put the ANTLR template into our project to pick it up by the Maven plugin.

This only works if the module is being built from the parent. Building the project from the CLI within the spring-data-jpa/spring-data-jpa directory will resort to the ANTLR-provided template.

Follow-up to #3282