Timeplus-connect

Bug Fix
- The client server_tz was not being correctly set if the server timezone was not UTC. This should close https://github.com/ClickHouse/clickhouse-connect/issues/377

Improvement
- The os user can now be sent as part of the User-Agent HTTP header. To disable this functionality for privacy reasons,
set the new common/global setting `send_os_user` to False. Closes https://github.com/ClickHouse/clickhouse-connect/issues/371.

Improvement
- Added the `AsyncClient` wrapper which is intended for `asyncio` environment usage. `AsyncClient` has the same methods
with the same parameters as the standard `Client`, but they are coroutines when applicable. Internally, these methods
from the `Client` that perform I/O operations are wrapped in a
[run_in_executor](https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.loop.run_in_executor) call.
See also the updated [run_async example](./examples/run_async.py).

Bug Fix
- If the ClickHouse server was behind an https proxy that required mutual TLS authentication, the client would incorrectly
attempt to use ClickHouse mutual TLS instead and authentication would fail. It should now be possible to authenticate
correctly in this situation by settings the `verify` parameter to `proxy`. This should close https://github.com/ClickHouse/clickhouse-connect/issues/370

Bug Fix
- Fix insert of UUID strings including dashes. Closes 368

Bug Fixes
- Set required minimum version for optional tzlocal dependency. Thanks to [drew-talon](https://github.com/drew-talon) for
reporting the issue and submitting the fix. Closes 360.
- Extended the effect of the `show_clickhouse_errors` client setting to exclude showing hostname and port for errors
when that setting is False. Thanks to [Andy](https://github.com/andy1xx8) for the PR!

Improvement
- Add the ability to bind arbitrary, "heredoc" data (including binary data) into the query, as described
[here](https://clickhouse.com/docs/en/sql-reference/syntax#heredoc). To use this functionality, use a single heredoc
tag, such as `$my_tag$`, in the query, and add that tag and the associated data into the query method `parameters` argument.
For some examples, see the `test_embedded_binary` test in [test_client.py](https://github.com/ClickHouse/clickhouse-connect/blob/main/tests/integration_tests/test_client.py).
Closes 363.

Bug Fix
- When using `query_df` with a FixedString column with a read format of 'string' (and the default `query_df` setting
`use_extended_dtypes=True`), the resulting column in the dataframe will now be correctly set to the (extended) String dtype.
Fixes https://github.com/ClickHouse/clickhouse-connect/issues/356