matcher for gensyms

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Context

macroexpand= is great; but unifies any symbol it recognizes as a gensym. providing a matcher-combinators matcher for gensyms allows for more specific matches

Task

1. add a GensymMatcher + wrapper fns
2. add readme examples

Additional resources

Blocked by #28, at least for the opt-in requirement of m-c.

In an internal project we use:

(defrecord GensymMatcher [expected]
 matcher-combinators.core/Matcher
 (match [_this actual]
   (let [value (symbol (string/replace actual #"(.?+)(\d)*" "$1"))]
     (if (= expected value)
       {:matcher-combinators.result/type   :match
        :matcher-combinators.result/value  value
        :matcher-combinators.result/weight 0}
       {:matcher-combinators.result/type   :mismatch
        :matcher-combinators.result/value  (model/->Mismatch expected value)
        :matcher-combinators.result/weight 1}))))