tp: run pipelines from their serialized plans

[LalitMaganti]

A pipeline statement currently runs through a TEMP virtual table created for it, with its execution plan bound to the statement as a pointer. The plan only lives as long as that one prepared statement, so SQL holding a pipeline can't be stored and run later, as views, functions and triggers do. That blocks letting pipelines appear inside ordinary SQL.

Instead, this writes the pipeline's optimized logical plan into the SQL itself:

SELECT c0 AS ts, c1 AS dur FROM __intrinsic_pipeline(X'...')

__intrinsic_pipeline is a single built-in table function which loads the plan and lowers it when it runs. The plan is everything needed to run the pipeline, so the SQL works wherever it ends up, with nothing to keep alive or clean up alongside it. This removes the per-statement tables and the machinery that retired and dropped them.

The plan is stored after optimization, so loading it is a matter of reading it back and lowering it: nothing is parsed or compiled again. Dataframes are looked up again by name, and a plan whose dataframes have changed shape since is refused. Anyone can write such bytes into SQL, so reading a plan checks it is one the compiler could have produced before anything runs it: truncated and corrupted plans are tested to be refused, or to run safely.

Nothing changes for users yet: pipelines still appear only as whole statements or as the body of a CREATE PERFETTO TABLE.

[github-actions]

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