feat: Enable stream-stream self-join in ksql (no optimization)

[vpapavas]

Description

Enable stream-stream self-join in ksql. They weren't supported before due to a missing feature in Streams. That feature has been added so we can support them now. Table-Table self-joins are not supported yet due to lacking support in Streams.

This PR is part of a series that will add support for optimized self-joins that use a single state store versus two.

Testing done

Added QTT tests.

Reviewer checklist

• Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• Ensure relevant issues are linked (description should include text like "Fixes #")

[spena]

LGTM.

[spena]

Can you add the GRACE PERIOD on all the tests? Joins with no grace period are deprecated and will be removed in the future.

ksql> CREATE STREAM OUTPUT AS SELECT * FROM L INNER JOIN R WITHIN 10 SECONDS ON L.A = R.A;

 Message                              
--------------------------------------
 Created query with ID CSAS_OUTPUT_11 
--------------------------------------
WARNING: DEPRECATION NOTICE: Stream-stream joins statements without a GRACE PERIOD will not be accepted in a future ksqlDB version.
Please use the GRACE PERIOD clause as specified in https://docs.ksqldb.io/en/latest/developer-guide/ksqldb-reference/select-push-query/

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