Make `parseSearch` and `serializeSearch` compliant with the WHATWG specification

[glowcloud]

Right now the parseSearch and serializeSearch functions in utils use custom string parsing:

swagger-ui/src/core/utils/index.js

Lines 607 to 633 in 1a22b31

	export const parseSearch = () => {
	let map = {}
	let search = win.location.search
	if(!search)
	return {}
	if ( search != "" ) {
	let params = search.substr(1).split("&")
	for (let i in params) {
	if (!Object.prototype.hasOwnProperty.call(params, i)) {
	continue
	}
	i = params[i].split("=")
	map[decodeURIComponent(i[0])] = (i[1] && decodeURIComponent(i[1])) || ""
	}
	}
	return map
	}
	export const serializeSearch = (searchMap) => {
	return Object.keys(searchMap).map(k => {
	return encodeURIComponent(k) + "=" + encodeURIComponent(searchMap[k])
	}).join("&")
	}

Instead, we should move to using URLSearchParams which will make these functions compliant with the WHATWG specification.

The functions should be rewritten into:

export const parseSearch = () => {
  const searchParams = new URLSearchParams(win.location.search)
  return Object.fromEntries(searchParams)
}

export const serializeSearch = (searchMap) => {
  const searchParams = new URLSearchParams(Object.entries(searchMap))
  return String(searchParams)
}

Based on: #9722 (comment)

[char0n]

Addressed in #9809 (review)

[glowcloud]

Released as https://github.com/swagger-api/swagger-ui/releases/tag/v5.15.2