Cassandra 4.1 announced a new option to create a role with:
`HASHED PASSWORD`. Example:
```
CREATE ROLE bob WITH HASHED PASSWORD = 'hashed_password';
```
We've already introduced another option following the same
semantics: `SALTED HASH`; example:
```
CREATE ROLE bob WITH SALTED HASH = 'salted_hash';
```
The change hasn't made it to any release yet, so in this commit
we rename it to `HASHED PASSWORD` to be compatible with Cassandra.
Additionally, we adjust existing tests to work against Cassandra too.
Fixesscylladb/scylladb#21350Closesscylladb/scylladb#21352
We add documentation for developers addressing
`DESCRIBE SCHEMA`. It covers the following aspects
of it:
* motivation,
* synopsis of the solution,
* implementation of the solution,
as well as a few subsections explaining the details:
* restoring process and its side effects,
* restoring roles with passwords,
* list of statements generated by `DESC SCHEMA`
with examples,
* implementation details.
