Seed and generic test support for DuneSQL

[0xRobin]

1. Copied generic spark tests to a _legacy version
2. Changed all current test refs to use the _legacy version
3. Included DuneSQL versions of the check_seed generic macro and tests
4. added support for varbinary in seed columns for DuneSQL seeds

[0xRobin]

After this is merged and you migrate a model that uses seed tests you should do the following steps to allow the seed test to run in DuneSQL.

1. add a _schema.yml file for your seed, add a dunesql tag and type any varbinary and uint256 columns

version: 2

seeds:
  - name: your_seed
    config:
      tags: dunesql
      column_types:
        tx_hash: varbinary
        amount: uint256

2. Check that any tests reference your new migrated model and not the _legacy version.
3. if using generic tests, change to the non-legacy version in the model schema file.

[jkylling]

Why the casts here?

[0xRobin]

In spark these columns had all kind of types (depending on the type of the column we're comparing), but for trino we need to unify them to 1 type (hence the varchar choice).

Note these casted columns are not used for the actual comparison, they are just included in the result table so you can easily see the cause of errors in the test results.

[jkylling]

Ah, makes sense. Could we add a comment on this? E.g., cast all columns to varchar to unify column types