This PR adds server-side `DESCRIBE` statement, which is required in latest cqlsh version.
The only change from the user perspective is the `DESC ...` statement can be used with cqlsh version >= 6.0. Previously the statement was executed from client side, but starting with Cassandra 4.0 and cqlsh 6.0, execution of describe was moved to server side, so the user was unable to do `DESC ...` with Scylla and cqlsh 6.0.
Implemented describe statements:
- `DESC CLUSTER`
- `DESC [FULL] SCHEMA`
- `DESC [ONLY] KEYSPACE`
- `DESC KEYSPACES/TYPES/FUNCTIONS/AGGREGATES/TABLES`
- `DESC TYPE/FUNCTION/AGGREGATE/MATERIALIZED VIEW/INDEX/TABLE`
- `DESC`
[Cassandra's implementation for reference](https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/cql3/statements/DescribeStatement.java)
Changes in this patch:
- cql3::util: added `single_quite()` function
- added `data_dictionary::keyspace_element` interface
- implemented `data_dictionary::keyspace_element` for:
- keyspace_metadata,
- UDT, UDF, UDA
- schema
- cql3::functions: added `get_user_functions()` and `get_user_aggregates()` to get all UDFs/UDAs in specified keyspace
- data_dictionary::user_types_metadata: added `has_type()` function
- extracted `describe_ring()` from storage_service to standalone helper function in `locator/util.hh`
- storage_proxy: added `describe_ring()` (implemented using helper function mentioned above)
- extended CQL grammar to handle describe statement
- increased version in `version.hh` to 4.0.0, so cqlsh will use server-side describe statement
Referring: https://github.com/scylladb/scylla/issues/9571, https://github.com/scylladb/scylladb/issues/11475Closes#11106
* github.com:scylladb/scylladb:
version: Increasing version
cql-pytest: Add tests for server-side describe statement
cql-pytest: creating random elements for describe's tests
cql3: Extend CQL grammar with server-side describe statement
cql3:statements: server-side describe statement
data_dictonary: add `get_all_keyspaces()` and `get_user_keyspaces()`
storage_proxy: add `describe_ring()` method
storage_service, locator: extract describe_ring()
data_dictionary:user_types_metadata: add has_type() function
cql3:functions: `get_user_functions()` and `get_user_aggregates()`
implement `keyspace_element` interface
data_dictionary: add `keyspace_element` interface
cql3: single_quote() util function
view: row_lock: lock_ck: reindent
test/topology: enable replace tests
service/raft: report an error when Raft ID can't be found in `raft_group0::remove_from_group0`
service: handle replace correctly with Raft enabled
gms/gossiper: fetch RAFT_SERVER_ID during shadow round
service: storage_service: sleep 2*ring_delay instead of BROADCAST_INTERVAL before replace
e6ffc22053