feat(stackable-operator): Add a utility for creating Java runtime arguments

[NickLarsenNZ]

idea (non-blocker): we could have a utility type for making properties. It might make this a little easier for humans to parse.

Originally posted by @NickLarsenNZ in stackabletech/spark-k8s-operator#451 (comment)

Maybe we already have something available, but this helps close the comment on the linked PR so it can be merged.

I'm thinking something like:

pub struct Properties(BTreeMap);

impl Display for JreProperties {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        todo!("iterate over the properties in self.0 and make -Dproperty=value joined by space");
        // write!(f, "{}", self.0)
    }
}

impl DerefMut for Properties {
   ...
}

See: https://docs.oracle.com/javase/8/docs/technotes/tools/windows/java.html#BABDJJFI

[NickLarsenNZ]

Look into this too: stackabletech/spark-k8s-operator#451 (comment)

[NickLarsenNZ]

Or if we see these kinds of things happening for other CLIs, we could do extensions to BTreeMap/HashMap if we have a variety of KV-pairs to list.

Eg:

• java_cli_properties (-Dproperty=value)
• jq_cli_args (--arg key value)
• ...