luaPackages.luarocks: generate luarocks as well

When installing a lua package that depends on luarocks, luarocks was not
capable of recognizing the luarocks module: https://github.com/NixOS/nixpkgs/issues/316009 .

As explained here https://github.com/luarocks/luarocks/issues/1659,
luarocks needs a manifest to recognize the package.
I first attempted to generate a manifest with `luarocks-admin
make-manifest` on our current manual luarocks derivation but this ended
up being too hackish as the `make-manifest` requires a .rockspec or
.rock to work, which we had not.

It seemed simpled to just rename the current manual luarocks derivation to luarocks_bootstrap
in order to break cyclic dependencies in buildLuarocksPackage and add a
generated luarocks derivation. Previously it was impossible to test
luarocks because of the cyclic dependency but we will now be able to
test the generated derivation.

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