Array parameters

[kylernd]

Reviving this as it was closed then the 1.5_maintenance branch was deleted
I have added some updates since then
Original PR: #5954

Generally describe what this PR will do, and why it is needed

• Adding support for array plugs on nodes to be passed as VectorData.
• Added Arnold node integration for array types
• Added in a node UI for array parameters that is based on the VectorData UI
• Tests for new array features

Related Issues

• Any Arnold node that requires array parameters can now have full support

Dependencies

• None

Breaking Changes

• None

Checklist

• I have read the contribution guidelines.
• I have updated the documentation, if applicable.
• I have tested my change(s) in the test suite, and added new test cases where necessary.
• My code follows the Gaffer project's prevailing coding style and conventions.