Implement a Dispatcher object for numba_dpex.kernel decorated functions

[diptorupd]

numba-dpex.kernel decorated functions use the numba_dpex.core.kernel_interface.dispacther.JitKernel class to dispatch kernel functions. The JitKernel class does not derive from Numba's Dispatcher leading to various limitations, such as:

1. Overloads cannot be defined in the DpexKernelTarget
2. Kernel functions cannot be called from dpjit
3. All the kernel submit and unbox/box of arguments logic is in Python.

The issue is to track changing the JitKernel class into a proper Dispatcher object.

List of changes that should be completed:

• Add a KernelDispatcher class that derives from numba.dispatcher.Dispatcher.
• Modify the kernel decorator to create an instance of the KernelDispatcher class rather than the JitKernel class.
• Override the compile method of the KernelDispatcher. The overridden method will generate a host wrapper function that uses the SPIR-V bitcode compiled for the kernel and generates a sycl::KernelBundle and launches it.
• Implement a cpu/host dpjit wrapper function to call kernels.
• Implement a step in the compilation pass where all functions in the kernel library (overloads, intrinsics) are linked together at the bitcode level using llvm-link and then fully inlined.
• Implement specialization of kernels in the new dispatcher.
• Convert the kernel API oclimpl intrinsic functions to overloads and move into a submodule inside core #795
• Enable caching of kernels in the numba_dpex.experimental.dispatcher.KernelDispatcher class. #1197
• Enable caching of compiled sycl::kernel_bundle wrapper objects in the experimental KernelDispatcher module #1208
• Port the func decorator to use the KernelDispatcher class. #1211
• Handle all issues identified by pylint in the numba_dpex.experimental module. #1196
• Make the new dispatcher work with Numba new_style errors. #1195

[diptorupd]

Marking the issue as completed barring the two pending tasks #795 and #1197. The remaining work can be tracked separately from the main task of creating a new Dispatcher for numba_dpex kernel.