[#692] commons-lang3 - Improve ToStringStyle configuration

[duttonw]

Re-factor toString to allow classes injection which does not need to be available on 'generate'. This allows inlined class usage without needing to build an independent jar to be available prior to generation step.

  -Xcommons-lang : generate toString(), hashCode() and equals() for generated code using Jakarta's common-lang [
	  -Xcommons-lang:ToStringStyle=MULTI_LINE_STYLE
	| -Xcommons-lang:ToStringStyle=DEFAULT_STYLE
	| -Xcommons-lang:ToStringStyle=NO_FIELD_NAMES_STYLE
	| -Xcommons-lang:ToStringStyle=SHORT_PREFIX_STYLE
	| -Xcommons-lang:ToStringStyle=SIMPLE_STYLE
	| -Xcommons-lang:ToStringStyle=NO_CLASS_NAME_STYLE
	| -Xcommons-lang:ToStringStyle=JSON_STYLE
	| -Xcommons-lang:ToStringStyle=<any static final variables inside org.apache.commons.lang3.builder.ToStringStyle following regex ^[A-Z0-9_]+>$
	| -Xcommons-lang:ToStringStyle=<Fully qualified class name of a ToStringStyle subtype>
]
 Note: custom ToStringStyle class is needed if you wish to turn off setUseIdentityHashCode on top of MULTI_LINE_STYLE

Also includes end to end testing for toString.