Improve Request and Response handling

[MattCCC]

Features:

• more strongly typed query params in fetchf() requests by default
• passed params can handle array of objects with "name" and "value" properties

Docs:

• updated coverage information

Fixes:

• don't attempt to serialize body payload if URLSearchParams are passed
• correctly parse "params" property passed in Request Config
• fetchf() wrapper should not make assumptions regarding request data/params
• more predictable body/data parsing inline with native fetch()
• correctly append query params to POST requests, if data/body are specified
• correctly handle charset in the content type headers when parsing response data
• bail parsing data early if there is no response body
• correctly parse text/ responses and streams
• normalize headers keys to lowercase as per IETF RFC 2616 4.2
• distingiush versions loaded by node and browsers

[github-actions]

size-limit report 📦

Path	Size
dist/browser/index.mjs	2.68 KB (+0.26% 🔺)
dist/browser/index.global.js	0 B (+100% 🔺)