Add query string parsing in get_file

[lab360-ch]

Lately, Figma tries to load the local fonts with an additional query parameter freetype_minimum_api_version.

Here is an example of the request URL: http://127.0.0.1:18412/figma/font-file?file=<font_path>&freetype_minimum_api_version=20

In the current implementation, the request URL /figma/font-file?file=<font_path>&freetype_minimum_api_version=20 only gets spliced and not properly parsed.

src/routes/get_file.rs:19

let file_path = string[22..string.len()].to_string();

Result of file_path for the given request URL is <font_path>&freetype_minimum_api_version=20 and should be <font_path>.

The changes in this pull request will parse the request URL and create an HashMap with all query parameters.