[WIP] Prototype to implement new SQL pipe syntax

[dtenedor]

What changes were proposed in this pull request?

[WIP] This is a prototype to implement the new SQL pipe syntax proposed by Google:

• https://research.google/pubs/sql-has-problems-we-can-fix-them-pipe-syntax-in-sql/
• https://github.com/google/zetasql/blob/master/docs/pipe-syntax.md

Why are the changes needed?

N/A

Does this PR introduce any user-facing change?

N/A

How was this patch tested?

N/A

Was this patch authored or co-authored using generative AI tooling?

N/A