[feature] concurrent safe write function

[0x-3FFF]

currently, the implementation of the write series function is concurrency-unsafe, it is recommended to introduce a concurrency-safe write function

[canelohill]

Concurrent writes are the top support issue for this package.

It's not useful to make the current methods threadsafe given the overall design of the API, but it might be worth doing to reduce the support burden.

[jaitaiwan]

I've been thinking about this for awhile. Do we support thread-safeness into the future or do we just say "too bad" and ask folks to find a better library. I'm not entirely sure.

[canelohill]

Drive the concurrency-related issues elsewhere by making the individual methods threadsafe. Support thread safety into the future.

Developers of robust applications will want to handle concurrency within their application code. The current API is no hindrance to those developers and may be preferable to other APIs.

I read through the examples in this repository and don't see how additional thread safety in the package will benefit them. Perhaps I need to spend more time looking at them. As an interesting side note, none of the examples use sync.Mutex.