Is it possible to specify multi hosts dsn for connection pool?

Personne n'a encore pris cette issue.

Is it possible to connect to several hosts (one master and replicas) from ConnectionPool (interface like libpq provides)?

I mean the following: https://www.postgresql.org/docs/current/static/libpq-connect.html
```
# Read sessions
postgresql://host1:123,host2:456/somedb?target_session_attrs=any

# Read-write sessions
postgresql://host1:123,host2:456/somedb?target_session_attrs=read-write
```
I enumerate all postgresql hosts and in target_session_attrs parameter specify `read-write` if i need master.

Or i should create separate connection pools for master & replicas servers?

How that functionality (switching between hosts depending on target_session_attrs attrs, re-connecting on master switch) can be implemented in asyncpg?

Start by reviewing asyncpg's ConnectionPool interface and the linked PostgreSQL libpq documentation for multi-host DSNs and target_session_attrs. The issue names no source files or tests; done would be clear support for multi-host selection and reconnection, or a documented alternative using separate pools.

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