Use `jsonb` data type for PostgreSQL to increase perfomance

[helloiamlukas]

To improve perfomance for Postgres databases, the json columns can use the jsonb data type.

This is will reduce responsetimes drastically when dealing with large datasets.

[what-the-diff[bot]]

• Changed the column type of settings from json to jsonb in asset containers table.
• Changed the column type of data from json to jsonb in assets meta table.
• Changed the column type of data from json to jsonb in blueprints table and added a unique index on handle and namespace columns together as they are used for querying data by both fields combined (handle,namespace).
• Same changes as above but with collections instead of blueprints: changed settings field's datatype from JSON to JSONB, also made it nullable since this is not required when creating new collection entries via API or UI; Also created an index on handle because we query based on that value alone sometimes (eager loading) - see https://github.com/statamic/cms/blob/master-v3/.github%2FISSUE_TEMPLATE%2FFEATURE_REQUEST-COLLECTION_ENTRY_INDEXES_.md#indexes .

[helloiamlukas]

Yes, you are right. I removed them now. Thanks for the hint!