Supplies proposal for KLIP-55, tablespaces

[MichaelDrogalis]

Initial proposal sketching the grammar.

[vcrfxia]

Seems similar to https://github.com/confluentinc/ksql/pull/7485. Is this proposal meant to replace the earlier one?

[MichaelDrogalis]

@vcrfxia Different idea - schemas give you isolation of names (namespaces). Tablespaces give you isolation of configuration. They can be used together.

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[vvcephei]

Closing stale PR. I'm sorry that we didn't get this done. Please resubmit as a new PR if you still want to get it in.