Adds support for sub-arrays for transform and transform_coordinates

Description

10cceac: Increased difficulty of sub-array testing
The sub-arrays are now extended, so that wrong usage will generate full random arrays, or out of buffer writes.

7eb18e9 : Fixes sub-array (cpu, cuda, oneapi, opencl) for transform
- Adds offset processing for the opencl/oneapi kernels (ft array)
- In all backends the provided ft array is verified for Linearity, and if not copied.
- Tests are extended for transform and transform_coordinates

Additional information about the PR answering following questions:

• Is this a new feature or a bug fix?
  • Bug.
• Why these changes are necessary.
  • Without this fix, arrayfire will give a response although based on random values. No error will be generated, so it will be unnoticed by most.
• Potential impact on specific hardware, software or backends.
  • None
• New functions and their functionality.
  • None
• Can this PR be backported to older versions?
  • No
• Future changes not implemented in this PR.
  • None

Changes to Users

Correct response will be provided in case of sub-arrays used in ft parameter.

Checklist

• Rebased on latest master
• Code compiles
• Tests pass
• Functions added to unified API
• Functions documented