Support passing additional command line options to Wires#CACHED_COMPILER

[glukos]

Example use case: pass --preview to allow compilation of method readers that import classes with preview features in the code. Currently, constructor that uses the default options Arrays.asList("-g", "-nowarn"); is hardcoded. For example, we can add a system property that lists additional options.

[RobAustin]

is this required for a client project? if not, I suggest we close this until it is required.