Add heap size variable for Windows playbook

[HusainYusufali]

• Heap size variable added to playbook. It defaults to normal
• To change heap size the extra variable must be added when running the playbook
• Playbook tested and still install hotspot with normal heap_size as the default
• Fixes Windows Playbook Java installation API broken #882
  Signed-off-by: HusainYusufali [email protected]

[sxa]

I don't have a particular issue with this, but is there an issue that this is a solution to? When would you need to choose the large heap variant?

[HusainYusufali]

This is so the when installing OpenJ9 variants it doesn't provide multiple variants and fail the playbook. We don't need to have heapsize the variable. I can just make it normal and remove the heapsize variable

[sxa]

No I'm happy with that. I'll hold off on merging it until @Willsparker has a chance to test it though as it'll be useful to have a windows PR to test something he's working on for me ;-)

[Willsparker]

Tested on a Windows Server 2012 Vagrant VM and it's all good 👍