bug: parameter in path matching fails on percent encoding in the URI

[Gary-Airwallex]

When APISIX calls dispatch it sends Nginx normalized URI which decodes percent encoded characters, i.e. /uri%20contains%20space would become /uri contains space. The matching behavior of radixtree should be aware of this decoding. Steps to reproduce

1. Create a new matching rule with a parameter in path

{
    paths = { "/test/:id/update" },
    methods = { "GET" },
}

2. Match the rule with an URI that contains space, e.g. /test/contains space/update
3. The URI is expected to match the parameter :id but it does not.