sql: add Index interface and TableDescriptor methods in catalog #58187
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Previously, the catalog.TableDescriptor interface and its implementing
types would liberally return descpb.IndexDescriptor values, pointers and
slices. In an effort to stop manipulating such protos directly, this
patch introduces a catalog.Index interface to encapsulate it. In order
to enventually propagate this change throughout the code base, this
patch marks some existing catalog.TableDescriptor methods as deprecated
and introduces new ones to eventually replace them.
Partially addresses #57465
Release note: None