Add name_func optional attribute for asyncpg adapter

I faced an issue related to pg bouncer and prepared statement cache flow in asyncpg dialect. Regarding this discussion https://github.com/sqlalchemy/sqlalchemy/issues/6467 I prepared PR to support an optional parameter `name` in prepared statement which is allowed, since 0.25.0 version in `asyncpg` https://github.com/MagicStack/asyncpg/pull/846

**UPD:**
the issue with proposal: https://github.com/sqlalchemy/sqlalchemy/issues/9608

### Description
Added optional parameter `name_func` to `AsyncAdapt_asyncpg_connection` class which will call on the `self._connection.prepare()` function and populate a unique name.

so in general instead this

```python

from uuid import uuid4

from asyncpg import Connection

class CConnection(Connection):
    def _get_unique_id(self, prefix: str) -> str:
        return f'__asyncpg_{prefix}_{uuid4()}__'

engine = create_async_engine(...,
    connect_args={
        'connection_class': CConnection,
    },
)

```

would be enough

```python
from uuid import uuid4

engine = create_async_engine(...,
    connect_args={
        'name_func': lambda:  f'__asyncpg_{uuid4()}__',
    },
)

```

### Checklist
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This pull request is:

- [ ] A documentation / typographical error fix
	- Good to go, no issue or tests are needed
- [ ] A short code fix
	- please include the issue number, and create an issue if none exists, which
	  must include a complete example of the issue.  one line code fixes without an
	  issue and demonstration will not be accepted.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.   one line code fixes without tests will not be accepted.
- [x] A new feature implementation
	- please include the issue number, and create an issue if none exists, which must
	  include a complete example of how the feature would look.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.

**Have a nice day!**

Fixes: #9608
Closes: #9607
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/9607
Pull-request-sha: b4bc8d3e57ab095a26112830ad4bea36083454e3

Change-Id: Icd753366cba166b8a60d1c8566377ec8335cd828

1 files changed, 17 insertions, 0 deletions

diff --git a/test/dialect/postgresql/test_async_pg_py3k.py b/test/dialect/postgresql/test_async_pg_py3k.py
index d9116a7ce..49014fcaf 100644
--- a/test/dialect/postgresql/test_async_pg_py3k.py
+++ b/test/dialect/postgresql/test_async_pg_py3k.py
@@ -1,4 +1,5 @@
 import random
+import uuid
 
 from sqlalchemy import Column
 from sqlalchemy import exc
@@ -272,3 +273,19 @@ class AsyncPgTest(fixtures.TestBase):
             await conn.close()
 
         eq_(codec_meth.mock_calls, [mock.call(adapted_conn)])
+
+    @async_test
+    async def test_name_connection_func(self, metadata, async_testing_engine):
+        cache = []
+
+        def name_f():
+            name = str(uuid.uuid4())
+            cache.append(name)
+            return name
+
+        engine = async_testing_engine(
+            options={"connect_args": {"prepared_statement_name_func": name_f}},
+        )
+        async with engine.begin() as conn:
+            await conn.execute(select(1))
+            assert len(cache) > 0