The intent is to ultimately replace ClientFieldValidator with this and
individual validators that interact with it.
* src/validate/ValidStateMonitor.js: Added
* test/validate/ValidStateMonitorTest.js: Added
This allows #validate to be used generically for any type of validation, not
just change events.
* src/validate/ClientFieldValidator.js (validate):
Accept and propagate all bucket data to `validate` event listeners.
* src/validate/ClientFieldValidator.js (monitor): Remove
This just concerns itself with something that it should be concerned about;
let the caller handle monitoring, now that we have a #validate method.
* src/validate/ClientFieldValidator (validate): Added
Extracted logic that previously was exclusive to #monitor; that method will
now simply invoke #validate.