Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
Use `consume_` consistently across the entire interface, instead of having some methods with `on_` and others with `consume_` prefixes.
So it can be used in code outside scylla-sstable.cc. This source file is quite large already, and as we have yet another large chunk of code to add, we want to add it in a separate file.