NXP backend: added support for `aten.conv_transpose1` and refactored `convolution_converter` #3655

Job	Run time
test-qnn / test-backend-linux (qnn, models) / linux-job	28m 18s
test-qnn / test-backend-linux (qnn, operators) / linux-job	15m 33s
test-qnn / test-backend-macos	-7s
test-qnn / package-golden-artifacts	2m 22s
	46m 6s

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