Incremental models (#4834)

* Model resource changes

* Update new model spec

* Update parser for new model spec

* Add output_table to model state + fix errors in tests

* Implement reconciler

* Implement duckdb model executor

* Add props resolution with incremental support

* Fix issues

* Fix frontend

* Support incremental state resolver

* Self review

* Fix CI

* Reduce nesting by extracting logic to util funcs

* Refactor model executor interface

* Fix lint

* Support appends and merges

* Clickhouse modeling

* Fix test

* Fix lint

* Rename file

* Incremental BigQuery to DuckDB

* Fixes

* Fix spec/refs hash for incremental models

* Misc. fixes

* Rename "state" to "incremental state" to avoid ambiguity

proto/gen/rill/admin/v1/admin.swagger.yaml

@@ -2289,7 +2289,7 @@ definitions:
       `NullValue` is a singleton enumeration to represent the null value for the
       `Value` type union.
 
-      The JSON representation for `NullValue` is JSON `null`.
+       The JSON representation for `NullValue` is JSON `null`.
 
        - NULL_VALUE: Null value.
   rpcStatus: