options.offset type is incomplete in both style/FillPattern.js and style/StrokePattern.js

[Pigeo]

In both style/FillPattern.js and style/StrokePattern.js, parameter options.offset is typed as:

@param {number} options.offset pattern offset for hash/dot/circle/cross pattern

However, the code in both classes also accepts an 2-dimensional array of numbers [x,y], and this is sometimes a must-have option (for ex. if you have hatches oriented at an angle of 135°, you can't simply pass a single number in the options.offset: it won't work! In such cases, you definitely need to pass an array of 2 different numbers).

Thus, the correct code should be:

@param {number|[number, number]} options.offset pattern offset for hash/dot/circle/cross pattern

Note that it also impacts incorrect (incomplete) types to be generated by Siedlrchr/types-ol-ext.

Thanks for all your amazing work on this project,
Best regards