Is there a plan to support the flutter version？

## New Feature
MapBox supports the official Flutter version of the SDK

## Why
1. As flutter becomes more and more popular, we hope to use the flutter version of the map directly in the flutter project to increase development efficiency, but there is currently no official version, and a third-party version https://pub.dev/packages/mapbox_gl has been found
2. If the flutter version is supported, those applications that use flutter will be very convenient to access

The issue names no files or tests. Start by reviewing the repository’s Swift iOS SDK scope and the request for official Flutter support, then clarify the supported Flutter target and integration boundaries. Done would require an agreed support plan, since the issue currently asks whether one exists.

Written by the indexing model from the issue text.