let PhysicalOptimizerRule accept SessionConfig instead of ConfigOptions

[gabotechs]

Which issue does this PR close?

• No issue.

Rationale for this change

Users might want to create their own PhysicalOptimizerRule implementations. Users might have their own SessionConfig.extensions. Users might want to use their own SessionConfig.extensions in their custom PhysicalOptimizerRule implementations.

This PR is needed for gabotechs#7, but it was factored out as it's an isolated change that could have value on its own.

What changes are included in this PR?

Changes signature of PhysicalOptimizerRule.optimze to take a SessionConfig rather than a ConfigOptions.

pub trait PhysicalOptimizerRule: Debug {
    /// Rewrite `plan` to an optimized form
    fn optimize(
        &self,
        plan: Arc<dyn ExecutionPlan>,
-       config: &ConfigOptions,
+       config: &SessionConfig,
    ) -> Result<Arc<dyn ExecutionPlan>>;
    ...
}

Are these changes tested?

yes, by current tests.

Are there any user-facing changes?

yes, PhysicalOptimizerRule.optimze now takes a SessionConfig rather than a ConfigOptions, which is a breaking non backwards compatible change.

[adriangb]

This seems like a reasonable change to me, but I think we should wait until we are certain we are going to need it for #18172 before we merge it to avoid breaking the API without good justification