Allow actions to run on H2 and sample database (#28212)

* Decouple checking ddl from classifying h2 stmts

- should enable followup for easily blocking more kinds of queries
- check all statements to make sure they aren't "ddl".

* fix classify-query

* linter fixes + get-field refactor

* return the CommandInterface values as ints

Reach into the CommandList when needed

* docstring wording

* catch invalid queries -- they can't be classified

* Remove action subtypes from inlined-models

* Add ddl check for `execute-write-query!`

* Remove ACCESS_MODE_DATA

* Check queries are single select statements

* Add test for sample database privileges

* Fix single-select check

* Add single-select test

* Rename and add more tests for checking read only commands

* commands -> statements

* Fix check-disallow-ddl-commands

* new line

* Add more read-only statements to the tests

* Update error text

* Use are

* Add integration test for executing actions with disallowed commands

* Add test before inserting row

* Run GRANT ALL ON SCHEMA "PUBLIC" TO GUEST

* Restore classify-query

* whitespace

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Co-authored-by: Bryan Maass <bryan.maass@gmail.com>