router: performance improvement around route matching: remove per-route cost of repeative work on request path/headers.

*Title*: performance improvement around route matching

*Description*:
Seems like some low hanging fruits for route matching performance improvement:

// In bool RouteEntryImplBase::matchRoute:

```
// we are initializing parsing QueryParams out of request path per route (if query parameters configured in the route):
if (!config_query_parameters_.empty()) {
Http::Utility::QueryParams query_parameters =
Http::Utility::parseQueryString(headers.getPathValue());
matches &= ConfigUtility::matchQueryParams(query_parameters, config_query_parameters_);
if (!matches) {
return false;
}
}

```

In PathMatcher::match(const absl::string_view path) there is a per-route cost of stripping the query/fragment from path:
I think there might be an issue for this already? We found this with a benchmark test.

```
bool PathMatcher::match(const absl::string_view path) const {
return matcher_.match(Http::PathUtil::removeQueryAndFragment(path));
}
```

[optional *Relevant Links*:]
>Any extra documentation required to understand the issue.