Flask-liquid

- Only clear environment-wide template cache if the cache is not `None`. Python Liquid
version 1.9.0 changed `liquid.Environment.cache` to be an `Optional[Mapping]`.
- Handle depreciation of `flask.signals_available`.
- Require Flask version 2.

- We now use `flask.globals.request_ctx` instead of `flask._request_ctx_stack` when
it is available. `_request_ctx_stack` is depreciated since Flask version 2.2.0 and
will be removed in 2.3.0.

First stable release.

- Fixed typing issues. MyPy in strict mode.
- Added `cache_size`, `expression_cache_size`, `template_comments`,
`comment_start_string` and `comment_end_string` arguments to `Liquid`. All of
these arguments get passed through to `liquid.Environment`.

- Added `render_template_async` and `render_template_string_async` functions for
rendering templates asynchronously.

- Added the `autoescape` argument to `Liquid`. If `True` (default), context
variables will be HTML escaped before output.
- Added the `auto_reload` argument to `Liquid`. If `auto_reload` is `False`,
automatic reloading of templates is disabled. For deployments where template sources
don't change between service reloads, setting auto_reload to `False` can yield an
increase in performance by avoiding calls to `uptodate`. Defaults to `True`.