rest: expose PG functions at /rpc

rename to pigo to avoid go.dev/doc/pgo name collision

rest: apply columnCast for Prefer: return=representation header

rest: include pg_matviews in schema cache

rest: add jsonb containment operators @> and <@

pipeline: add support for mqtt tls, topic-rewrite, scaler-payload

rest: support header Prefer count=exact

rest: add order=similarity(colname, search string) using pg_trgm

pipeline: support extracting/constructing fields from mqtt topic

rest: add Prefer header support for conditional RETURNING

rest: change schema_table to schema.table in openapi doc

docs: add some benchmark results

rest: add auth options in openapi spec

fix: ensure pgxpool.Conn is always released

rest: add omitempty flag to skip NULL values in JSON responses