Add change note

Author: smowton

java/ql/lib/change-notes/2023-10-24-java-renames.md

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+category: minorAnalysis
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+* Java classes `MethodAccess`, `LValue` and `RValue` were renamed to `MethodCall`, `VarWrite` and `VarRead` respectively, along with related predicates and class names. The old names remain usable for the time being but are deprecated and should be replaced.
+* New class `NewClassExpr` was added to represent specifically an explicit `new ClassName(...)` invocation, in contrast to `ClassInstanceExpr` which also includes expressions that implicitly instantiate classes, such as defining a lambda or taking a method reference.