vim-patch:beb02ed: runtime(java): Optionally highlight parameterised types

In the presence of parameterised types whose names begin
with a capital letter and end with a less-than sign "<" that
introduces a type argument or a list of comma-separated type
arguments, followed by a greater-than sign ">", a variable
"g:java_highlight_generics" can be defined to have some
components of such types uniformly coloured (by picking
highlight groups for javaGenericsC{1,2}, javaWildcardBound).

For example,
------------------------------------------------------------
java.io.InputStream stream = java.io.InputStream.nullInputStream();
java.util.function.Function<String,
    java.util.function.BiFunction<String, String, String>> updater =
	property -> (oldValue, newValue) -> oldValue;
java.util.logging.LogManager.getLogManager()
    .updateConfiguration(stream, updater);
------------------------------------------------------------

Note that the diamond form and explicit type arguments do
not qualify for this kind of recognition.

For example,
------------------------------------------------------------
new java.util.HashSet<>().<String>toArray(new String[0]);
------------------------------------------------------------

References:
https://docs.oracle.com/javase/specs/jls/se21/html/jls-4.html#jls-4.5
https://docs.oracle.com/javase/specs/jls/se21/html/jls-15.html#jls-15.9
https://docs.oracle.com/javase/specs/jls/se21/html/jls-15.html#jls-15.12.2.1

closes: vim/vim#15050

https://github.com/vim/vim/commit/beb02ed674bc61f179c4ff71e93bdeeb44fe9c4e

Co-authored-by: Aliaksei Budavei <0x000c70@gmail.com>

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