Resolve "Implement Quadkey functions"

Closes #22 (closed)

• Added all functions related to Quadkeys from https://learn.microsoft.com/en-us/bingmaps/articles/bing-maps-tile-system
• Added package quadkeyfunctions, with one function get_quadkey_functions, that reads all SQL files in the directory
• Added function implement_quadkey_functions in the PostGIS Database

\approve @ds @gislars

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• 07ddf0bd - Add SQL functions to generate quadkeys

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• 6b8b5920 - Add docstring

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• 77816653 - Change copyright year

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• 2e703b41 - End of line

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• 51103aad - Add linter

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• b456d9a5 - linters

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• ab869cfc - Add python wrapper

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marked this merge request as ready

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assigned to @ds and unassigned @laurens

assigned to @laurens and unassigned @ds

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• a1110fd9 - Resolve comments

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