Moves ConnectorMetadata to planner session for PartiQLPlanner re-use

[RCHowell]

Relevant Issues

N/A

Description

This PR replaces #1309 as we need function information to come from the catalog (ConnectorMetadata).

Other Information

• Updated Unreleased Section in CHANGELOG: [YES/NO]
  Yes

• Any backward-incompatible changes? [YES/NO]

  • < If YES, why? >
  • < For this purpose, we define backward-incompatible changes as changes that—when consumed—can potentially result in
    errors for users that are using our public APIs or the entities that have public visibility in our code-base. >
    Technically yes, but these are unreleased. This will be in a 0.14.1 patch to replace lost functionality of 0.14.0-alpha used by the transpiler.

• Any new external dependencies? [YES/NO]

  • < If YES, which ones and why? >
  • < In addition, please also mention any other alternatives you've considered and the reason they've been discarded >
    No

• Do your changes comply with the Contributing Guidelines
  and Code Style Guidelines? [YES/NO]
  Yes

License Information

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[johnedquinn]

This looks good to me. While we know these new functions will eventually be replaced via some mechanism of the SQL Path, do you want to add an experimental tag? Non-blocking, but something to consider before release.