Stop using deprecated search API from EPSG.io

[petrsloup]

Summary

This PR updates a single example demonstrating map reprojection by full-text searching for coordinate systems.
The Coordinate system search API from EPSG.io is going to be deprecated soon and is replaced by the similar API from MapTiler Cloud. (That requires a free key, but the same key from other examples can be used here as well.)

The API is very similar, but some minor changes were required.

Note

Only the dynamic full-text search (and remote transformation API) is getting deprecated, the https://epsg.io/${code}.proj4 is still going to work as before, so this code does not require any change:

openlayers/src/ol/proj/proj4.js

Lines 95 to 98 in faccc50

	let epsgLookup = async function (code) {
	const response = await fetch(`https://epsg.io/${code}.proj4`);
	if (!response.ok) {
	throw new Error(`Unexpected response from epsg.io: ${response.status}`);

[github-actions]

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[ahocevar]

Thanks, @petrsloup