Add a method that converts given term to the matching expression.
It will be used as an intermediate step when implementing evaluate(expression).
evaluate(term) will convert the term to the expression and then call evaluate(expression).
For terminals this is simply calling get() to serialize the value.
For non-terminals the implementation is more complicated and will be implemeted in the following commits.
Signed-off-by: Jan Ciolek <jan.ciolek@scylladb.com>
f86a1270b0