Enable auto discovery of Checkstyle config file via gradle plugin

[blipper]

What problem are you trying to solve?

Easy of configuration for initial users

Describe the solution you'd like

rewrite-gradle-plugin/plugin/src/main/java/org/openrewrite/gradle/isolated/DefaultProjectParser.java

Lines 1340 to 1353 in 459570d

	private List<NamedStyles> getStyles() {
	if (styles == null) {
	styles = environment().activateStyles(getActiveStyles());
	File checkstyleConfig = extension.getCheckstyleConfigFile();
	if (checkstyleConfig != null && checkstyleConfig.exists()) {
	try {
	styles.add(CheckstyleConfigLoader.loadCheckstyleConfig(checkstyleConfig.toPath(), extension.getCheckstyleProperties()));
	} catch (Exception e) {
	logger.warn("Unable to parse Checkstyle configuration", e);
	}
	}
	}
	return styles;
	}

has the code to load checkfile config files.

It would be great if the plugin could A) detect if the checkstyle plugin was loaded
B) at task execution time us the configFile value automatically from https://docs.gradle.org/current/dsl/org.gradle.api.plugins.quality.CheckstyleExtension.html#org.gradle.api.plugins.quality.CheckstyleExtension:configFile

Have you considered any alternatives or workarounds?

You can manually configure this but non-obvious.

Additional context

Are you interested in contributing this feature to OpenRewrite?