PytatoPyOpenCLArrayContext: add support for kernel profiling (#311)

* Fix ruff 0.11.4 error

* PytatoPyOpenCLArrayContext: add support for kernel profiling

* add a simple test

* remove global pyopencl import

* replace argument indicator

Co-authored-by: Alexandru Fikl <alexfikl@gmail.com>

* add add_profiling_event

* outline multi-kernel per t_unit implementation

* small fixes

* refactor tabulate_profiling_data

* add test to disable

* rename to private fields/method

Co-authored-by: Andreas Klöckner <inform@tiker.net>

* refactor to simplify API

* bit more doc

* factor out profile enable/disable

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Co-authored-by: Alexandru Fikl <alexfikl@gmail.com>
Co-authored-by: Andreas Klöckner <inform@tiker.net>