Feature: allow OpenLayers Filter instances in WfsFilterUtil

[ahennr]

This PR introduces some new functionality to the existing WfsFilterUtil such that filters created by attributeDetails in a searchConfig can either

• be overwritten by a custom OpenLayers filter instance, e.g.

const myConfig: SearchConfig = {
  ...searchConfig,
  filter: olFilter,
  olFilterOnly: true
};

• be enhanced by a custom OpenLayers filter instance (using And - filter), e.g.

const myConfig: SearchConfig = {
  ...searchConfig,
  filter: olFilter,
  olFilterOnly: false
};

If no filter is passed in searchConfig, the filter creation is performed as currently implemented.

Plz review @terrestris/devs

[ahennr]

Partially solves !22

[annarieger]

isn't this one a breaking change? (method return type is changed)

[ahennr]

I renamed OlFormatFilter to OlFilter, so here's no breaking change imho. On the other hand, I agree that switch of null to undefined is rather a breaking change. I'll change the commit message accordingly.

[ahennr]

Please check again @annarieger 🙏🏼

[github-actions]

🎉 This PR is included in version 16.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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