feat: support provide a matched table to store matched conditions

[vm-001]

local Router = require "radix-router"
local router = Router.new({
  {
    paths = { "/static" },
    methods = { "GET" },
    hosts = { "example.com" },
    handler = "1",
  },
  {
    paths = { "/a/{var}", "/b/{var}" },
    methods = { "POST", "PUT" },
    hosts = { "*.example.com" },
    handler = "2",
  },
})


local matched = {}
router:match("/b/var", { method = "PUT", host = "www.example.com" }, nil, matched)
print(matched.path) -- "/b/{var}"
print(matched.host) --  "*.example.com"
print(matched.method) -- "PUT"