Fix SIGSEGV in compress filter when appended before open

Fix SIGSEGV in compress filter when appended before open

Calling archive_read_append_filter(a, ARCHIVE_FILTER_COMPRESS) would
previously trigger a crash because compress_bidder_init() attempted to
read header bits from the upstream filter immediately. If the archive
was not yet opened (common when setting up filters), the upstream filter
state was not ready for reading.

This commit defers the header reading and decompressor initialization
until the first read operation (lazy initialization), consistent with
other filter implementations in libarchive.

Added test_read_append_compress_filter.

Bug: https://github.com/libarchive/libarchive/issues/2514
Test: ./libarchive_test test_read_append_compress_filter