Feat: Nessie support

[erindru]

This addresses issue #3673

We actually already support Nessie today, it's just not clear from the docs.

Nessie can run in REST Catalog mode (iceberg.catalog.type=rest) which Trino's Iceberg connector can use no problem.

I've:

• Added Nessie (in REST mode) to our test suite, it's just another case for Trino which already has Hive / Delta / Iceberg+HiveMetastore (so this added Iceberg+REST)
• Updated the docs to clarify how to use Nessie with SQLMesh

Note that it looks like Trino is abandoning the "native" Nessie catalog type in favour of the REST catalog. The "native" Nessie catalog still does not support views so cannot be used with SQLMesh.