swiper should init rtl based on document dir

[Farbdose]

Clear and concise description of the problem

When creating a swiper it always assumes direction = "ltr" unless told otherwise either through the usage of the dir property or through calling the changeLanguageDirection function.

Suggested solution

On creation the main init function could check for the overall document direction and set it accordingly. The behavior could be controlled by providing "auto" as dir attribute on the swiper:

if (swiper.dir == "auto") {
    swiper.changeLanguageDirection(document.documentElement.getAttribute("dir"));
}

Alternative

No response

Additional context

Dynamic changes of the language direction can be handled by the developer based on concrete implementation.

Validations

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

Would you like to open a PR for this feature?

• I'm willing to open a PR

[nolimits4web]

It already checks document and element direction https://github.com/nolimits4web/swiper/blob/master/src/core/core.mjs#L545