ci: publish proof-of-sql-planner (#750)

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# Rationale for this change
We haven't been publishing `proof-of-sql-planner` which we do need to be
doing from now on since we need to use it.
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 Add `NestedLoopJoinExec`.
 Closes #345.

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# What changes are included in this PR?
Publish `proof-of-sql-planner`
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# Are these changes tested?
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Author: iajoiner

crates/proof-of-sql-planner/Cargo.toml

@@ -1,5 +1,6 @@
 [package]
 name = "proof-of-sql-planner"
+publish = true
 edition.workspace = true
 exclude.workspace = true
 repository.workspace = true