add a spec compliant parser for Accept HTTP header values

[Geal]

we need to look at values from the Accept header in various places:

router/apollo-router/src/axum_http_server_factory.rs

Lines 614 to 624 in 6131e06

	fn prefers_html(accept_header: &HeaderValue) -> bool {
	accept_header
	.to_str()
	.map(|accept_str| {
	accept_str
	.split(',')
	.map(|a| a.trim())
	.any(|a| a == "text/html")
	})
	.unwrap_or_default()
	}

and

https://github.com/apollographql/router/pull/1610/files#diff-3bc7e7515da7351dcdea41fed01f6e494bde5289b83b981b424c6d67358b25d6R157-R160

Splitting directly on , or ; is not enough because there can be quoted strings, so we need a correct parser here

[glasser]

see also picoHz/mediatype#4

[glasser]

Hey look what we just lazywebbed into existence: https://docs.rs/mediatype/latest/mediatype/struct.MediaTypeList.html