RD-294: Move the list of map languages to maptiler-client

[jonathanlurie]

RD-294

The goal is to centralize the list of languages so that it can be used by multiple JS/TS tools and libraries.

[zdila]

For addLanguageGeocodingOptions we should probably not auto-detect it on client-side but on server-side, which is already implemented. That implementation uses Accept-Language parameter and takes q value into the account together with support of every provided language. Current implementation of addLanguageGeocodingOptions which uses getAutoLanguageGeocoding may pass also unsupported language if navigator is undefined.

Actually if language is not specified in options, this server-side detection applies as the language url parameter is not added.

Also we should add support for no language preference which would result in searchParams.set("language", "") call. I think that Language.LOCAL could be used for this althought it is not 100% the same thing, as you will find London also when you type Londýn even you did not specify Slovak language.

[zdila]

I also prefer to use ternaries to multiple if (condA) return A; if (condB) return B; ... return X; - so rather return condA ? A : condB ? B : X;.

Also I prefer not using temporary variables, like let foo = bar(); return foo; but rather use return bar(); directly.

But it is only my subjective preference.