Rename geometry-filter "other" to geometrycollection and add more geom-filters

[SlowMo24]

Problem Description

The geometry filter "other" is not well defined (at least not in the docu of the ohsome-api). It remains unclear what it contains, apart from geometry-collections.

Expected Solution

Be explicit on the filters. Add filters for Polygon vs MultiPolygon (vs Polygonal) etc.

Alternative Solutions

Document what 'other'-geometry type is.

### Additional Context
Add any other context or screenshots about the feature request here.

Related: #436

[Hagellach37]

@tyrasd will check if this is still the case.

[tyrasd]

Yes, the documentation is concise, but IMHO sufficient: ”matches anything which has a geometry of the given type (point, line, polygon, or other)” means that other is everything that is not a point, line or polygon.

Polygon vs MultiPolygon (vs Polygonal)

geometry:polygon is implemented to match everything that is polygonal. I used the simpler wording on purpose in the docs, as it is more easily understandable. Also, I think it's not necessary to provide more detailed filters for only MultiPolygon or non-multi polygonal geometries.

[SlowMo24]

but there is an inconsistency in:

oshdb/oshdb-filter/src/main/java/org/heigit/ohsome/oshdb/filter/GeometryTypeFilter.java

Lines 33 to 42 in 20bd2c8

	public enum GeometryType {
	/** A point geometry (JTS: {@link Puntal}). */
	POINT,
	/** A line geometry (JTS: {@link Lineal}). */
	LINE,
	/** A polygon or multipolygon geometry (JTS: {@link Polygonal}). */
	POLYGON,
	/** A geometry collection which is not a multipolygon. */
	OTHER
	}

because it links to Puntual/Lineal but only considers Points/Lines. MultiPoint or MultiLinestrings are considered GeometryType.OTHER (if they are even recognised?).

I'm sorry for being such a nit-picker but downstream tools require me to be exact on my geometries.