private void addCharset(String name, int charSize) {
		CharsetInfoRec rec = new CharsetInfoRec(name, charSize);
		charsetInfoRecsByName.put(name, rec);
		charsetNamesList.add(name);
	}
Register minimal set of Java Charsets to facilitate most test without
Application initialization overhead.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/CharsetInfo.java