new luv_cleanup to handle cleanup of non-gc resources #755
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This adds a solution to the problem of cleaning up luv resources when using an external uv_loop_t in cases such as neovim introduced by moving work cleanup into the
__gc
for the loop.This function is necessary for external loops to not leak memory when luv is no longer in use.
Likely solution for #754.
Associated with the merging of this PR a note should be placed on the previous release about the introduction of this issue and that the solution is to update and use this function.