Hash on route definition

[stackoverfloweth]

This PR introduces a type and service for Hash similar to Path, Query, and Host. Each of these parts of the url can be defined when calling createRoute. It's normalized from string | undefined | Host on Route and is combined down from parent routes to children routes. Host is checked for route matching rules, route scoring (for multiple matches), and is used when assembling a URL for a given route.

Some places where Host is different

• Host doesn't currently have any params, so there are no param on the host type
• The Host type also adds hasValue: () => boolean to the type. I found this useful because host will insert "#" only when there is a value that passes stringHasValue check.
• Users can use the host utility when calling createRoute but it won't offer any utility over a plain string
• Route push/replace also takes a { host: string } in the options, the route.hash wins over the options.hash

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