feat: migrate DSN types from pydantic.networks

[bBlazewavE]

Summary

Migrates all DSN types from pydantic.networks to pydantic-extra-types as preparation for pydantic V3.

Closes pydantic/pydantic#9071

Types Migrated

Type	Base	Schemes
PostgresDsn	MultiHostUrl	postgres, postgresql+asyncpg, +psycopg2, etc
CockroachDsn	Url	cockroachdb, +psycopg2, +asyncpg
AmqpDsn	Url	amqp, amqps
RedisDsn	Url	redis, rediss
MongoDsn	MultiHostUrl	mongodb, mongodb+srv
KafkaDsn	Url	kafka
NatsDsn	MultiHostUrl	nats, tls, ws
MySQLDsn	Url	mysql, +pymysql, +asyncmy, etc
MariaDBDsn	Url	mariadb, +pymysql, etc
ClickHouseDsn	Url	clickhouse, +native, +asynch
SnowflakeDsn	Url	snowflake

Implementation

Each type uses Annotated[Url/MultiHostUrl, UrlConstraints(...)] pattern, consistent with pydantic-core types. Multi-host types (Postgres, Mongo, NATS) use MultiHostUrl base.

Files

• pydantic_extra_types/dsn.py — All 11 DSN type definitions with docstrings and examples
• tests/test_dsn.py — Comprehensive test suite covering valid URLs, invalid scheme rejection, and host-required validation

Testing

All 13 test cases pass. Tests cover:

• Valid DSN parsing for each type
• Invalid scheme rejection
• Host-required enforcement
• Cross-type validation

[yezz123]

Hello @bBlazewavE you can complete the work on this pr i will be happy to merge it as soon as everything migrated and all the tests passed

[bBlazewavE]

Hello @bBlazewavE you can complete the work on this pr i will be happy to merge it as soon as everything migrated and all the tests passed

Hi @yezz123 I have fixed the test on this PR, it's ready for review ! : )

[yezz123]

Looks clean 👍🏻

I will merge it