Automatic database role detection

[levkk]

Description

• Detect database roles based off of pg_is_in_recovery value. Dynamic discovery of database role #563
• Support LOCK, DO $$ (partially) for schema-based sharding Schema-based sharding #596
• Added idle_in_transaction metric to SHOW STATS and Prometheus metrics @jaggederest

[codecov]

Codecov Report

❌ Patch coverage is 76.65904% with 102 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pgdog/src/stats/pools.rs	0.00%	26 Missing ⚠️
pgdog/src/backend/databases.rs	86.59%	13 Missing ⚠️
pgdog/src/backend/pool/shard/monitor.rs	35.00%	13 Missing ⚠️
pgdog/src/backend/pool/replicas/mod.rs	83.07%	11 Missing ⚠️
pgdog/src/backend/pool/shard/role_detector.rs	52.17%	11 Missing ⚠️
pgdog/src/frontend/router/parser/query/ddl.rs	84.21%	9 Missing ⚠️
pgdog/src/backend/server.rs	90.47%	4 Missing ⚠️
pgdog-config/src/database.rs	50.00%	3 Missing ⚠️
pgdog/src/backend/pool/lsn_monitor.rs	72.72%	3 Missing ⚠️
pgdog/src/backend/pool/replicas/detected_role.rs	70.00%	3 Missing ⚠️
... and 3 more

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