Implement possibilities to receive billing(invoice data)

[push1st1k]

_As cloud user I want to have possibilities to receive invoice data_

Proposed signature is:

InvoiceData getInvoice(int year, int month, String pricingAccountAlias);

InvoiceData getInvoice(Date date, String pricingAccountAlias);

InvoiceData getInvoice(LocalDate localDate, String pricingAccountAlias);

InvoiceData getInvoice(Calendar calendar, String pricingAccountAlias);

InvoiceData getInvoice(int year, int month);

InvoiceData getInvoice(Date date);

InvoiceData getInvoice(LocalDate localDate);

InvoiceData getInvoice(Calendar calendar);