Lift the maximum deserialization size to 2 GiB from 512 MiB

[pleroy]

This is a stopgap measure for helping users who run into #3375.

This PR also adds code that I wrote while debugging the issue and that might be useful in the future:

1. Add an operator<< for class DelegatingArrayInputStream to print out the chunk being deserialized.
2. Add support for scanning a journal without executing it; for large journals, this makes it possible to quick figure out what is at the end of the journal, in particular any unpaired method.
3. Make some replay error messages more helpful.
4. Add code to verify the output of the serialization by immediately trying to deserialize it.
5. Log the serialized size of vessels and the number of chunks emitted for a save.