More java.io.File cleanup.

Make File.list (and friends) cost one JNI call instead of four,
and move the conversion of UTF-8 byte sequences into the JNI, so
it returns String[] instead of byte[][].

Switch to readdir_r(3) so we don't need the JNI to be "static
synchronized".

Remove fixed-length buffers from the native code.

Fix leaks by introducing a "proper" native container (similar to
std::forward_list). We should still investigate either using
std::vector or passing in an ArrayList<String> and using JNI to
call ArrayList.add, but this is a step forward from the old
code anyway.

Bug: 2281992

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