feat(quickbooks): create customer, update customer and find customer actions

[kishanprmr]

What does this PR do?

Fixes #4031

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[ikus060]

@kishanprmr Thanks for you contribution. I was looking for this piece for my integration. I need to create an estimate and a customer. I can't wait to test it.

I see you created the code for Customer. How hard is it to add other entry point like estimate ?

[ikus060]

My I suggest a different approach to this implementation that would unblock this piece.

I would recommend splitting the creation of invoice and the creation of item/lines in the invoice in two different actions. That would allow creation of an empty invoice, followed by the creation of one or multiple invoice lines based on different condition.