Add concurrency_limiter

[kajarenc]

A concurrency limiter decorator could be used to limit the concurrent execution of functions. Could be useful for heavy computation/memory tasks, or when a task to requests to API with rate limits.

@concurrency_limiter(max_concurrency=1)
def heavy_computation():
    st.write("Heavy computation")
    progress_text = "Operation in progress. Please wait."
    my_bar = st.progress(0, text=progress_text)

    for percent_complete in range(100):
        time.sleep(0.15)
        my_bar.progress(percent_complete + 1, text=progress_text)
    st.write("END OF Heavy computation")
    return 42

my_button = st.button("Run heavy computation")

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