extraneous parenthesis at pretty-printing, should take into account operator precedence

We all know that Spoon is generous at putting parentheses, in particular for binary operators and cast expressions.

One way to solve this is to use the implicit information from CTElement to signal parenthesis to be written:

CtBinaryOperator.isImplicit() == true => no parentheses required
CtBinaryOperator.isImplicit() == false => parentheses required

See also the discussion about sniper at https://github.com/INRIA/spoon/issues/3794

Start by reading the CtBinaryOperator and CTElement APIs, then review the discussion in issue #3794 about sniper. Trace how pretty-printing handles binary operators and cast expressions, especially operator precedence and the isImplicit() signal. Done means generated Java no longer contains unnecessary parentheses while preserving required grouping.

Written by the indexing model from the issue text.