Add all the available greek tax offices (ΔΟΥ)

[tsevdos]

First let's identify / collect all the data, and as a second phase we can start creating various utility methods (ex. in GeoUtils).

[DionisisChris]

Found from https://aade.gr/epikoinonia/plirofories-doy

Here is the excel containing all the required info.

euretirio_xorikis.xlsx

[DionisisChris]

Initial aggregation of the data from euretio_xorikis.xlsx(above) is done and can be found in the attached JSON.
The aggregation has been made in a tree style as shown in the diagram bellow.

Still pending the mapping of the data with the existing types.

Please for you feedback :)
test.json

[DionisisChris]

Adding the Json with the mapping.
taxOffices-el.json

The structure that I used is the following.
export type TaxOffice = { id: number; name: string; unit: Unit[]; };

[tsevdos]

fixed with #76