✨ Add socket::send_exact #6
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The regular send method can return early after sending part of the buffer (for example because the tcp window is full) and hence needs to be usually used in a loop until the whole buffer is sent or an error has occurred.
send_exact implements this loop, which is especially usefull when using the callback variant, because the callback wont get invoked until theres an error or all the data is sent, which drastically reduces the amount of boilerplate code.