* feat: Introduce describe-indexes

Fixes: #49981

Introduce a faster sync with describe-indexes that follows describe-fields
and describe-fks to allow for a database wide sync step rather per table
describe-table-indexes.

Implement for psotgres

* Fix formatting

* Add tests

* Update src/metabase/driver.clj



* Update src/metabase/driver.clj



* Address PR review

* Fix null schema check

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Co-authored-by: Case Nelson <case@metabase.com>
Co-authored-by: metamben <103100869+metamben@users.noreply.github.com>