Add LayerAccessHandler

[jampukka]

Add new type of OskariComponent called LayerAccessHandler to handle layer access.

Currently the only method in the API void handle(OskariLayer layer, User user); gets called when a layer is "accessed" meaning when a data accessing request is made to the backing service via oskari-server. Right now this includes action routes GetLayerTile for WMTS/WMS layers, GetWFSFeatures for WFS/OAPIF layers, and GetPrint for all types of layers as service-print works a bit differently. There's no way for this method to change the logic (except by throwing RuntimeExceptions I guess). LayerAccessHandler isn't meant for checking or validating anything but more for logging or monitoring purposes.

The idea is to allow server-extensions to provide their own implementations of LayerAccessHandlers which will get loaded at runtime. For more discussion see: oskariorg/oskari-docs#243

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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