[cmd3] Add rising and falling edge trigger factories (#8366)

`Trigger.getAsBoolean()` behavior has been changed from passing through
the underlying boolean supplier to returning the latest cached signal as
determined by the most recent call to `poll()`. This allows rising and
falling edge triggers to have a consistent return value over an entire
polling cycle, rather than only being high for the _first_ check in a
cycle.

Closes #8309

styleguide/checkstyle.xml

@@ -176,7 +176,7 @@ module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
     </module>
     <module name="LambdaParameterName">
       <property name="format"
-        value="^(_?[a-zA-Z]|_?[a-z][a-zA-Z0-9]+)$" />
+        value="^(_|_?[a-zA-Z]|_?[a-z][a-zA-Z0-9]+)$" />
       <message key="name.invalidPattern"
         value="Lambda parameter name ''{0}'' must match pattern ''{1}''." />
     </module>