[jrubyscripting] Implement dependency tracking (#13810)

[jrubyscripting] Implement dependency tracking (#13810)

* [jrubyscripting] implement dependency tracking

watchers had to be refactored similar to jsscripting.
it supports watching any directory referenced from RUBYLIB,
as well as the gem home. it properly excludes lib and gem home
(as well as other gem homes if you have multiple jruby versions
installed) from loading as regular scripts.

this is a breaking change if you don't have RUBYLIB explicitly
configured, and you are using the old default directory.

it's expected that the detection of what files and gems any
given script uses will be self-identified by the script, presumably
by the helper library.

JRubyScriptEngineConfiguration was largely refactored as part of this.
 * CONFIGURATION_PARAMETERS was renamed, and is no longer static, since
   it's modified every time the configuration is changed
 * OptionalConfigurationElement was simplified since default values
   are always provided now. this also simplified lots of other code
   that accesses the current settings.

Signed-off-by: Cody Cutrer <cody@cutrer.us>