Toucan-connectors

Changed

- It is now possible to import all connectors models without having any extra installed
- The deprecated `GoogleSpreadsheet` connector has been removed.
- The deprecated `GoogleSheets2` connector has been removed.

Changed

- Postgres: Rather than being silently caught, exceptions happenning in `get_form` and `get_model` are now logged
- HTTP: The `custom_token_server` authentication type now accepts a `token_header_name` kwarg. It allows to override the name of the
authorization header, which defaults to `Authorization`.

Changed

- `get_model` now alphabetically sorts the columns before returning them, in order to ensure result consistency.
- `get_model` now supports an `exclude_columns` argument defaulting to `False`. It allows to not retrieve columns in the model.
This is only implemented in the Postgres connector for now.
- `get_model` now supports `schema_name` and `table_name` arguments, allowing to filter on a specific table and/or schema.
This is only implemented in the Postgres connector for now.
- DiscoverableConnector: `format_db_model` is now roughly 3x faster, resulting in performance gains in `get_model`.

Changed

- Hubspot: added support for listing and selection of custom objects

Changed

- Hubspot: added support for custom attributes

Fix

- Athena: params are now correctly interpolated

Fix

- Dependencies: removed the upper bound on peakina