Support HTTPX cli

[karpetrosyan]

I think it would be great for us to support httpx cli, but with the HTTP caching layer.

We could have our own cli entry point, which is going to be hishel,
and we can just take the existing httpx cli and change the Client class to CacheClient, and that's it.

We should try to do this without sticking to the particular HTTPX version, so we can be sure that by adding this feature, we are not making the development process more complicated.
I guess for the start we could just mock the httpx module because httpx cli does not support client injecting.

Examples:

Instead of

httpx https://hishel.com --download hishel.html --proxies https://example.com --timeout 5

do

hishel https://hishel.com --download hishel.html --proxies https://example.com --timeout 5

[T-256]

https://github.com/encode/httpx/blob/fd60b1815cf92354d097ac46aea63ebc0f34fd21/httpx/_main.py#L309-L447

Is there anyway to get these lines from httpx._main at runtime and decorate over our hishel client instead?

[karpetrosyan]

You can just import the main function, decorate and then call it

Maybe we could also add storage and controller-related options, for example, to specify where the response should be stored.