Add convenience method to retrieve ScriptInfo/ModuleInfo from script

[imagejan]

As suggested by @ctrueden on gitter, we should add a convenience method to ScriptService that returns a ScriptInfo or ModuleInfo for a given script.

Something like getScriptInfo(String filename, String script) ?

[imagejan]

As we have:

scijava-common/src/main/java/org/scijava/script/ScriptService.java

Lines 124 to 128 in dc8ea6d

	/**
	* Gets the cached {@link ScriptInfo} metadata for the script at the given
	* file, creating it if it does not already exist.
	*/
	ScriptInfo getScript(File scriptFile);

already, we might want to keep it consistent and overload the getScript method like this:

/**
 * Creates the {@link ScriptInfo} metadata for the provided script.
 */
ScriptInfo getScript(String languageExtension, String script);

Would you be fine with that, @ctrueden? I can submit a PR updating ScriptService and DefaultScriptService then.

[ctrueden]

Sounds good, @imagejan! 👍