fix: add proxy for downloading libblink_cmp_fuzzy

[drowning-in-codes]

The Curl command itself does not use system proxies, so use environment variables to avoid not being able to download the blink libraries in some regions.

[Saghen]

Thanks! I believe we should only support https since we'll never need to download over http. Also add a configuration option fuzzy.prebuilt_binaries.use_system_proxy that enables this behavior (on by default), with a description indicating that it loads your HTTPS_PROXY env when true. It'd be great to also have a fuzzy.prebuilt_binaries.system_proxy_url, which would be a URL to use