PRESIDECMS-2745 add various request level caching to rules engine #1393
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PRESIDECMS-2745 add various request level caching to rules engine.
The idea here is that the result of condition and expression evaluation
will not change within the scope of a request and neither will a payload
for a given context. In complicated pages with a lot of conditions to run,
we can save a lot of resource by caching results.
n.b. While here, also reduce use of member functions.