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Bug/607 fidelity statevector kernel cannot be pickled (#778)

* Made fidelity_statevector_kernel picklable

Added a new param to store cache size and a custom __getstate__  and __setstate__ to handle removing and re-initliasing the lru cache during pickle/unpickling respectively.

* updated notes

* name changes

* spell corrections

* Updated description

* Added unittest for pickling

* Spelling changes

* Making error messages clearer

* Spelling -_-

* Update releasenotes/notes/fix-fid_statevector_kernel-pickling-b7fa2b13a15ec9c6.yaml

Co-authored-by: Declan Millar <declan.millar@ibm.com>

* Update .gitignore

Co-authored-by: Declan Millar <declan.millar@ibm.com>

* Update test/kernels/test_fidelity_statevector_kernel.py

Co-authored-by: Declan Millar <declan.millar@ibm.com>

* Update qiskit_machine_learning/kernels/fidelity_statevector_kernel.py

Co-authored-by: Declan Millar <declan.millar@ibm.com>

* Update test/kernels/test_fidelity_statevector_kernel.py

Co-authored-by: Declan Millar <declan.millar@ibm.com>

* Update qiskit_machine_learning/kernels/fidelity_statevector_kernel.py

Co-authored-by: Declan Millar <declan.millar@ibm.com>

* Added Any class

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Co-authored-by: M. Emre Sahin <40424147+OkuyanBoga@users.noreply.github.com>
Co-authored-by: Declan Millar <declan.millar@ibm.com>
Co-authored-by: Anton Dekusar <62334182+adekusar-drl@users.noreply.github.com>

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