Add new fuzz inputs after package_rbf changed

[murchandamus]

After the package_rbf fuzz target was updated, the old fuzz inputs produced sub-optimal coverage, so I put together some new fuzz inputs for the updated target.

The old fuzz inputs after bitcoin/bitcoin#30300 was merged:

#1188	DONE   cov: 3651 ft: 20819 corp: 388/13927Kb lim: 1041407 exec/s: 132 rss: 618Mb

After fuzzing a bit and creating a fresh set_cover_merge from old and new:

#195	DONE   cov: 3676 ft: 21559 corp: 193/15247Kb lim: 796083 exec/s: 24 rss: 580Mb

I decided to merge the result from the set_cover_merge rather than replacing the old fuzz inputs, so that the fuzz test continues to work for older versions of the master branch and the latest major release.

[maflcko]

lgtm